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

A bullet of mass 10gm moving with a velocity 'u' penetrates 4cm in to

1.	A bullet of mass 10gm moving with a velocity 'u' penetrates 4cm in to a target before coming to rest. If the average resistance offered by the target is 200N, the value of 'u' is
Answer» `20 MS^(-1)` `40 ms^(-1)` `60 ms^(-1)` `80 ms^(-1)` Answer :B