Question

A force of 49 Newtons is applied to a rock, which causes it to be lifted 2 meters in 5 seconds. How much power is exerted during this time?

Select one:
9.8 W
19.6 W
56.4 W
98 W

Answer 1

Answer: 19.6 watts

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Step-by-step explanation:

power = (change in work)/(change in time)

p = w/t

work = force*displacement

w = f*d

So we can say:

p = (f*d)/t

We know the following

• f = 49 = applied force
• d = 2 = displacement
• t = 5 = change in time

Leading to...

p = (f*d)/t

p = (49*2)/5

p = 98/5

p = 19.6 watts

Side note: 1 watt is equal to 1 joule per second