 Alright, so how many of you have done the homework? Or at least attempted it? I don't care whether it is. Attempted as in have you attempted more than 30 questions? More than 20? Okay, fine. See the, for you to at least struggle little bit so that you again prefer back to the nodes and then during that process of struggling with the question you learn a lot of things. So those who have actually attempted the entire assignment do you think that you have learned something? Right, so now that learning will stay with you. So it is very easy to make fun of people who have done the assignment. It is very easy to do that. It doesn't be a genius to make fun of anything. In fact it takes a fool to make fun of somebody who is working a little hard. So you can afford to do that right now but you will slowly understand that as you progress into the next and next grade you know I have seen many times people who are in class 11th and 12th they are not able to solve the simplest of the questions. What happens because they have ignored the learning in 9th and 10th. I am not saying that you will not get marks. Getting marks in 9th and 10th it is very easy because these kind of questions I have given you will not be asked in the exam as such. But I am preparing you for the competition to come in 11th and 12th. So take it seriously for your own sake. If you do a little bit hard work right now you will say a lot of I mean you will not have to do extreme hard work in 11th and 12th. It will be very easy going for you. If you do not by the time you go to 11th you will see that many of your peers have gone ahead and then you intend to give up that you don't have time or you are getting frustrated. So again one more thing I wanted to tell you is that till now we are in a mode of always scoring above 90% or at least above 80%. So we tend to expect that whatever I do I should get more than 90% or 80% whatever. But do you guys know that for example J-Main's results have come. People who score 50-60% marks their ranks are around 4-5,000 out of 20 lakh. And those people who are scoring 80% in J advance they are topping the exam. They are all in rank 1. And if you are scoring 60% in J advance you will be probably 2100 regularly getting into the IITs. So why I am in a pressure of getting everything correct whatever I do you tend to ignore the kind of learning you will be having. So I should get each and every question right and if I am not getting right then something is wrong with me and you start getting. A lot of pressure will pile up in you. So do not pressurize yourself. What I told attempted. Did I say that because this is the first time you are attempting something which is slightly indirect. We are used to of having questions like that for example distance is 2 meter, time taken is 1 second, what is the speed. And do you learn anything solving those kind of questions hundreds and tons of those type of questions you will not learn anything. So that is why expose yourself to these kind of questions it will really make a difference. Maybe not now but definitely when you go to higher standards you will be far ahead of your peers. And you will be lot more relaxed also later on because you have already learned the tricks whatever it takes. So again I am repeating do not pressurize and if you are not understanding if you are not able to solve a particular question something is wrong. You know you start putting lot of pressure you start getting frustrated need not be. These questions are not meant to be solved completely 100% nobody will be able to do it at your stage. So I will continue with this chapter. So last class we had some quiz sort of thing. So all of them are sitting together or they are mixed up now. So today's class we will be solving numericals and we will be taking some standard theoretical questions that can be asked in your school exams. So since we are taking numericals we will be taking it gradually from the base level we will go up to the high level questions. So before we even start that let us first understand what kind of numericals can be asked. What are things can be asked. In this chapter in the motion what is causing the motion. High can be asked but this is very important the way he said height may be asked. Now in that question it will not be directly raised. So you have a story the question may not be done something like this might be there. So you have in that story yes or no that should be when you look at it like this you write in every next step. Do not just read the particular question and straight away jump into problem solving. So this is very important step and the answer. Tell me the question. Okay then we will get into the equation. What? A is equal to? Okay so shardha. Shardhuli. Okay shardhuli has acceleration formula. What is the average final velocity minus initial velocity divided by delta t whatever delta t final velocity this is average. Okay so your object is moving in a straight line write this down the motion in a straight line only this is true. That is not in your syllabus right now in our syllabus. Okay can you tell me what is the average acceleration? Okay now here is something very important is coming up. You have to assume direction you know for example sense yes or no. So these minus of 2 there is minus 2. So throughout the chapter remember this will be after you. And time taken is simple okay. A to B acceleration t square then p square equal to u square plus 2 as then equal to u plus a t. Now these are very important these three equations are extremely important alright. They are relating the future with the present what is happening fine. So you have your question okay which is not proper displacement and then substituting here to get the time fine. So do not ask when it need not be what will stop you is understanding the question and writing the variables fine. So when that will go away in whatever revision we have done for this chapter. That is the numerical then you may apply the wrong equation but I am answering it. This one between the motion in opposite directions that is it. See the graph now if I tell you that this is the graph this is x and this is t. Can you tell me a method to find the velocity using this graph all of you method. So can you tell me a method to find the velocity. No as I you tell right. So how you this divided by that is your answer. You can find the velocity using x t graph. In the second time we do not want the time. Time is this distance this length this much length. And acceleration graph for x t. All of you please attempt it. What is x? x is actually i. This is not possible. Why? You are trying to find it. Okay so some of you have very some of you have like this. This one starts from this one. Okay right so you can look at now. You can see the steepness is decreasing. And then steepness is going on. Okay so this is x t graph and acceleration. Straight line should increase. What? It is velocity. It is velocity but it is not the path okay. What is the job going on? Come here and share with everyone. Okay so next time you try a job in the middle of the class. Share it with everyone. In a way there is a change in the object and then starts moving with acceleration. Does this it means get the direction.