First slide

Power

Question

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

Moderate

A
B
C
D

Solution

F = constant
$∴$ a = constant or v = at
Now, $P = F \cdot v = F \cdot at or P \propto t$ ( As F and a both are constants)
Hence, P-t graph is a straight line passing through origin.

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