CAIE A-Level Physics AS 5.1.6 P W T Questions

Use P = W / t to calculate power from work done and time taken, and rearrange the equation.

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Use P = W / t to calculate power from work done and time taken, and rearrange the equation.

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A motor is used to lift a load vertically upwards.
The load has weight W.
The motor produces useful power output P.
The load is lifted at constant velocity v.
Which expression gives the time taken for the motor to lift the load vertically upwards through a distance d ?

$\frac{P}{W d}$

$\frac{W_{v}}{P}$

$\frac{W d}{P}$

$\frac{P v}{W}$

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CAIE A-Level Physics AS 5.1.6 P W T Questions question 1