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

From the formulae `v_(1)= ((m_(1)-m_(2))/(m_(1) + m_(2))) u_(1)`
We get `v= ((M-m)/(M + m))u`