Two identical balls A and B having velocities of `0.5 ms^(-1)` and `-0.3 ms^(-1)` respectively collides elastically in one dimension. The velocities of B and A after the collision will be

Options

A. `-0.5 ms^(-1) and 0.3 ms^(-1)`
B. `0.5 ms^(-1) and -0.3 ms^(-1)`
C. `-0.3 ms^(-1) and 0.5 ms^(-1)`
D. `0.3 ms^(-1) and 0.5 ms^(-1)`

Answer

B

Explanation

Masses of the balls are same and collision is elastic, so their velocity will be interchanged after collision
`:. v_A= +u_B = -0.3 ms^(-1) and v_B = u_A = 0.5 ms^(-1)`.