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

A bullet of mass 10 gm moving with a velocity .u. penetrates 4 cm in t

1.	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
Answer» `20 ms^(-1)` `40 ms^(-1)` `60ms^(-1)` `80 ms^(-1)` ANSWER :B