Q.

A motor drives a body along a straight line with a constant force. The power P developed by the motor must vary with time t as

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a

b

c

d

answer is A.

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Detailed Solution

F =  constant∴ a = constant or v  =  atNow,   P=F·v=F· at or P∝t    ( As  F and a  both are constants)Hence, P-t graph is a straight line passing through origin.
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