A ball reaches a racket at 60 m s - 1 along + x direction and leaves the rocket in the opposite direction with the same speed. Assuming that the mass of the ball as 50 g and the contact time is 0 . 02 second, the force exerted by the racket on the ball is

Question

A ball reaches a racket at 60 m s - 1 along + x direction and leaves the rocket in the opposite direction with the same speed. Assuming that the mass of the ball as 50 g and the contact time is 0 . 02 second, the force exerted by the racket on the ball is, 300 N along + X direction, 300 N along - X direction, 300 kN along + X direction, 300 kN along - X direction

MARKS App · Accepted Answer

The change in momentum of the ball, Δ p = mv - - mv = 2 mv = 2 × 0 · 0 5 × 6 0 = 6 kg m s - 1 Force exerted on the bell by the rocket, F = Δ p Δ t = 6 0 · 0 2 = 3 0 0 N

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