Question

A body projected horizontally with an acceleration of $gm/s^2$ from a height $h$ reaches the ground with a vertical velocity of $3km/hr$, Another body was dropped from the same height $h$ with an initial speed $4km/hr$ , At what velocity will the body reach when it reaches the ground?

• A. $3km/hr$
• B. $4km/hr$
• C. $5km/hr$
• D. $12km/hr$

Answer 1

The correct option is C $5km/hr$

Vertical velocity will be energy gained due to acceleration of gravity. So same effect will be on the secomd body in vertical direction so conserving energy for second body $v_f=\sqrt{4^2+3^2}$. So final velocity will be 5m/s.