A ball of mass 3 kg , moving with a speed of 100 m s - 1 , strikes a wall at an angle 60 ° (as shown in figure). The ball rebounds at the same speed and remains in contact with the wall for 0 . 2 s ; the force exerted by the ball on the wall is:

Question

A ball of mass 3 kg , moving with a speed of 100 m s - 1 , strikes a wall at an angle 60 ° (as shown in figure). The ball rebounds at the same speed and remains in contact with the wall for 0 . 2 s ; the force exerted by the ball on the wall is:, 1500 3 N, 1500 N, 300 3 N, 300 N

MARKS App · Accepted Answer

Change in momentum, ∆ p = m ∆ v ⇒ ∆ p = 3 100 cos 30 ° ⇒ ∆ p = 3 × 2 × 100 × 3 2 ⇒ ∆ p = 300 3 ∆ F = ∆ p ∆ t ⇒ ∆ F = 300 3 0 . 2 = 1500 3 N

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