 So here is the next question guys, a ball starts from rest. So let's start solving this problem. A ball starts from rest and let me take another color. Yeah, man down and rolls down 16 meters down an incline plane in four seconds. So time is given. What is the acceleration of the ball and what is the velocity of the ball at the bottom of the incline? So let's draw an incline plane. Okay, so this is the incline plane. So yeah, so this is the incline plane itself. Okay, and there is a ball which is rolling down the incline plane. Okay, let's this is the initial velocity and and starts from rest. So instead of v, you should write u initial velocity is zero. And let's say at this point t is equal to zero starts rolling at t equals to zero. And at t is equal to four seconds, what is happening? The ball is here. Okay, and it is moving down with the velocity v which is unknown. Right, and it rolls down 16 meters. So one more information is given and that is from here to this point. The distance traveled is 16 meters. Isn't it? So now I don't think it is much of a problem here to solve this one. So let's solve u is equal to zero. Right, t is equal to four seconds and s is given as 16 meters. So all the information is given. You have to find out final velocity or what is the acceleration of the ball? So acceleration can be found out by second equation of motion s is equal to ut plus half at squared. Now clearly this is zero, u is zero. Correct, so hence a is nothing but twice s c. I have not deployed the values as of now. I will deploy it only at the end so that my formula is correct. A is 2s by t square. Now let's deploy the value s is 16 meters and divide by always check error zone as we have, you know, error zone is what units, units you have to take care of. Don't miss the unit. So two into 16 meters, very good. T is four seconds, so four squared. So four square and 16 will go. So a is two meter per second square. First part is done. First part is done. Next part, second part is what is the velocity of the ball at the bottom of the incline? So now that a is known, you can use the third equation of motion, which is v square is equal to u square plus twice a s. Now this one is again zero because u is zero. So hence v is under root twice a s, right? What is twice a s? Let's solve two a, a is how much? Acceleration is two and s is how much? 16, so easily we can find out the square root. Square root is nothing but two square and four square it is. So hence simply two into four is equal to eight and what should be a unit of velocity since everything is in a unit meter per second. Okay, so we could find out what is the final velocity, correct? So this was fairly simple question. You have to take care of units. Do not miss the units and always deploy the values. If not needed, if this is not complicated calculation, deploy the values towards end, towards the end only, right? What do I mean? So keep playing with variables as far as possible, okay? And in the last step, you can, you know, calculate the value so that you minimize your calculation mistake, if any, okay? Copy and understood this.