Question

From a building two balls A and B are thrown such that A is thrown upwards and B downwards, both vertically and same magnitude. If $V_A$ and $V_B$ are their respective velocities on reaching the ground, then

• A. $V_B>V_A$
• B. $V_A=V_B$
• C. $V_A>V_B$
• D. $velocitiesdependastheirmasses$

Answer 1

The correct option is B $V_A=V_B$

From law of conservation of energy,
PE at height ‘h’ = KE at ground
$mgh=\frac{1}{2}m{v}^2\therefore v=\sqrt{2gh}\therefore v\alpha \sqrt{h}\Rightarrow v_A=v_B$