Two blocks $A$ and $B$ are released from the top of a rough inclined plane so that $A$ slides along the plane and $B$ falls down freely. Which will have higher velocity on reaching the ground ?
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As the block $A$ slides down along the rough inclined plane, it will lose energy due to opposing frictional force. Hence, the block $B$, which is falling freely, will reach the ground with higher velocity.
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