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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A ball of mass m moves with speed v and strikes a wall normally, reflecting back normally. If its time of contact with the wall is t, find the force exerted by the ball on the wall.

Answer: (A)

Solution

Change in momentum = mv − (−mv) = 2mv (the velocity reverses direction). Average force = Δp/t = 2mv/t.

Question ID VK-153172