A ball is thrown upwards. It returns to ground describing a parabolic path.Which of the following remains constant.

Speed of the ball

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Kinetic energy of the ball

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Vertical component of velocity

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Horizontal component of velocity.

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Solution

The correct option is D Horizontal component of velocity.
Acceleration along vertical component $= - g$ (negative sign indicates downward direction), hence vertical component of velocity changes.
Net acceleration is not equal to zero and hence speed of the ball changes which implies kinetic energy of the ball changes.
Acceleration along horizontal = 0, hence horizontal component of velocity does not change.

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