If it took you 5 seconds to move a rock 15 meters using a force of 150 Newtons, how much power did you need to use? 500 joules/sec
45 joules/sec
4,500 joules
450 joules/sec

Given that:

Time taken = 5 seconds

Distance = 15 meters

Force = 150 Newtons

Power = ?

Recall that power is the rate of work done per unit time

i.e Power = work / time

(since work is a product of force and distance, then

power = (force x distance)/ time

Power = (150 Newtons x 15 m) / 5 s

Power = 2250 / 5

Power = 450 joules per second

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