 Hi, and welcome to our session. Let us discuss the following question. The question says the resultant of two forces, p and q, acting at a point is at right angles to force p. While the resultant of forces, p and s, acting at the same angle, is at right angles to force s, prove that p is equal to square root of x cubed. Now, this is the force p and q, and the resultant of these two forces, that is hard one, is at right angle to force p. And the resultant of force p and s is at right angle to the force x. We have to prove that p is equal to square root of s into q. Now, we can get the solution. Let the angle between force p and q be theta, which is between p and resultant of p and q, that is this. It will be given by tan alpha equals to q sin theta, y. So, this is the angle p and resultant of p and q. We have given that y is equal to pi, where this resultant is at right angle to force p equation 2.