A ball of mass 0 . 15 kg hits the wall with its initial speed of 12 m s - 1 and bounces back without changing its initial speed. If the force applied by the wall on the ball during the contact is 100 N . calculate the time duration of the contact of ball with the wall.

Question

A ball of mass 0 . 15 kg hits the wall with its initial speed of 12 m s - 1 and bounces back without changing its initial speed. If the force applied by the wall on the ball during the contact is 100 N . calculate the time duration of the contact of ball with the wall., 0 . 018 s, 0 . 036 s, 0 . 009 s, 0 . 072 s

MARKS App · Accepted Answer

Given: m = 1 . 5 kg & u = 12 m s - 1 Change in the momentum of the ball after the collision = 2 m v = 2 × 1 . 5 × 12 = 36 N s As the force applied during collision is equal to 100 N and if t is the duration of collision, so 100 × t = Δ p ⇒ t = 36 100 s t = 36 × 10 - 2 s = 0 . 036 s

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