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A boy throws a ball with a mass of 0.40 ...

A boy throws a ball with a mass of 0.40 kg against a brick wall. The ball hits the wall at 30 m/s are rebounds at 20 m/s. During its collision with the ball, the impulse of the net force on the ball is

A

4Ns

B

20NS

C

10Ns

D

50 Ns

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