A ball of mass 0.4 kg hits a brick wall. The ball strikes when it is moving horizontally to the left at $30 m s^{- 1}$ and rebounds horizontal at 20 $m s^{- 1}$ . Find the impulse of the force exerted on the ball by the wall.

20

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Solution

The correct option is D $20$ Ns
$m v_{f} - (- m v_{t}) = \cdot 4 (30 + 20) = 20 N s$

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A ball of mass 0.4 kg hits a brick wall. The ball strikes when it is moving horizontally to the left at 30 ms−1 and rebounds horizontal at 20ms−1. Find the impulse of the force exerted on the ball by the wall.

The correct option is D 20 Nsmvf−(−mvt)=⋅4(30+20)=20Ns

A ball of mass 0.4 kg hits a brick wall. The ball strikes when it is moving horizontally to the left at $30 m s^{- 1}$ and rebounds horizontal at 20 $m s^{- 1}$ . Find the impulse of the force exerted on the ball by the wall.

The correct option is D $20$ Ns
$m v_{f} - (- m v_{t}) = \cdot 4 (30 + 20) = 20 N s$