Question

Two balls of different masses are thrown vertically upwards with the same speed from a height $h$. They pass through the point of projection in their downward motion with ________. (Consider resistance due to air is zero).

• A. Heavier ball having more speed
• B. Lighter ball having more speed
• C. Both having same speed
• D. Both having different speeds

Answer 1

The correct option is C Both having same speed

For each ball, apply equation of motion:

$v^2=u^2+2as$

$v$ : Final velocity of particle

$u$ : Initial velocity of particle

$a$ : Acceleration of particle

$s$ : Displacement of particle

When passing through the point of projection in a downward motion,

$a=-g$ and $s=0$.

$v=-u$

Hence, both balls have the same speed at every point of motion it means the speed of both particles does not depend upon the mass of the particle.