When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?

Solution(By Examveda Team)

When a ball is thrown vertically upwards, several physical quantities change during its motion. However, one quantity that remains constant during its motion is energy.

As the ball rises, its kinetic energy decreases while its potential energy increases. When it reaches its highest point and starts to fall back down, the potential energy decreases, and the kinetic energy increases. The total mechanical energy (the sum of kinetic and potential energy) remains constant as long as no external forces (like air resistance) are acting on the ball.

The other options are not constant during the motion:
Option B: Displacement changes continuously as the ball moves up and then comes back down.
Option C: Velocity changes as the ball moves upward (velocity decreases) and then downward (velocity increases).
Option D: Acceleration is also not constant. It changes due to the gravitational force, causing deceleration as the ball rises and acceleration as it falls.

So, the correct answer is Option A: Energy, which remains constant during the motion of a ball thrown vertically upwards, provided there are no external forces affecting it.