Two equal masses `m_1` and `m_2` moving along the same straight line with velocites `+3 m//s` and `- 5 m//s` respectively collide elastically. Their velocities after the collision will be respectively.

Options

A. `+ 4 m//s` for both
B. `- 3 m//s and + 5 m//s`
C. `- 4 m//s and + 4 m//s`
D. `-5 m//s and + 3 m//s`

Answer

D

Explanation

(d) As `m_1 = m_2`, therefore after elastic collision velocities of masses get interchanged
i.e., velocity of mass `m_1 = - 5 m//s`
and velocity of mass `m_2 = + 3 m//s`.
.