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Question

A block of mass m is pulled by a constant power P placed on a rough horizontal plane. The friction coefficient between the block and surface is μ. Find the maximum velocity of the block.

A
Pμmg
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B
P2μmg
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C
P4μmg
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D
2Pμmg
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Solution

The correct option is B Pμmg
Power P=F.v=constant F=PvorF1v
as v increases, F decreases.
when F=μmg, net force on block becomes zero, i.e., it has maximum or terminal velocity
P=(μmg)vmaxorvmax=Pμmg

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