A big ball of mass M , moving with velocity u strikes a small ball of mass m , which is at rest. Finally small ball obtains velocity u and big ball v . Then what is the value of v

Options

A. `(M-m)/(M+m) u`
B. `m/(M+m) u`
C. `(2m)/(M+m)u`
D. `M/(M+m)u`

Answer

A

Explanation

`v=((M-m)u)/(M+m) +0`