Two identical balls `A and B` having velocity of `0.5 m//s and -0.3 m//s` respectively collide elastically in one dimension. The velocities of `B and A` after the collision respectively will be

Options

A. 0.3 m/s and 0.5 m/s
B. `–0.5` m/s and 0.3 m/s
C. 0.5 m/s and –0.3 m/s
D. `–0.3` m/s and 0.5 m/s

Answer

D

Explanation

Mass of balls are same and the collision is perfectly elastic, so their velocity will be interchanged. i.e.,
`V_A =-0.3 m//s V_B = 0.5 m//s`