A ball of mass 0.5 kg moving with a velo...

A ball of mass `0.5 kg` moving with a velocity of `2 m//s` strikes a wall normally and bounces back with the same speed . If the time of contact between the ball and the wall is 1 millisecond , the average force exerted by the wall on the ball is

2000 N

1000 N

5000 N

125 N

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