A massive ball moving with speed v collieds with a tiny ball which is intially at rest having a mass very much smaller than the mass of the first ball. The collision is elastic, then immediately after the impact, the second ball will move with a speed approximately equal to :-

Options

A. `v`
B. `2v`
C. `v/3`
D. infinite

Answer

`(2)`

Explanation

`m_(2) lt m_(1)` and
`vec v_(2) = ((2m_(1))/(m_(1) + m_(2)))vec u_(1) + ((m_(2) - m_(1))/(m_(1) + m_(2))) vec u_(2)`