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?
Question
Question
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?
Answer: 450 watts
Explanation:
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 watts
Thus, you need to use 450 watts