A bullet of mass 10 gm moving with a velocity 'u' penetrates 4 cm in to a target before coming to rest. If the average resistance offered by the target is 200 N, the value of 'u' is
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A bullet of mass 10 gm moving with a velocity 'u' penetrates 4 cm in to a target before coming to rest. If the average resistance offered by the target is 200 N, the value of 'u' is