A body of mass m moving with a constant velocity v hits another body of equal mass moving with equal speed but in the opposite direction and sticks to it. The velocity of the compound body after collision is

Options

A. V
B. 2 V
C. zero
D. `-2V`

Answer

C

Explanation

`v=(m_1v_1+m_2v_2)/(m_1+m_2) or v=(m(V)+m(-V))/(m+m)=0`