A ball `A` is thrown up vertically with a speed `u` and at the same instant another ball `B` is released from a height `h`. At time `t`, the speed `A` relative to `B` is

Options

A. u
B. 2 u
C. u= 2gt
D. ` sqrt(( u^(2) -gt))`

Answer

A

Explanation

`V_A=u-gt,V_B =- "gt" rArr V_A-V_B =u`