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

Kinetic energy of the ball

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Speed of the ball

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Horizontal component of velocity

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none of these

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Solution

The correct option is C Horizontal component of velocity
Horizontal velocity $= v cos θ$
Vertical velocity $= v sin θ$
Since there is no acceleration in $x$ direction hence the velocity in X- direction remain Constant

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