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Physics · LAWS OF MOTION
हिन्दीA ball is released from rest from a height \( h = 0.8 \text{ m} \) on a smooth inclined plane. It then rolls onto a horizontal surface with a coefficient of kinetic friction \( \mu = 0.2 \). What is the distance \( s \) travelled by the ball on the horizontal plane before coming to rest?
Correct answer · Option 3
\( 4 \text{ m} \)
Explanation
By conservation of energy, potential energy lost equals work done against friction: \( mgh = \mu mg s \implies s = \frac{h}{\mu} = \frac{0.8}{0.2} = 4 \text{ m} \).
