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Brianna weighs 425 N. She climbs a flight of stairs to a height of 8 m. It takes her 6 seconds.

How much work does Brianna do when she climbs the stairs?

A.
71 J

B.
2550 J

C.
3400 J

D.
53 J

Sagot :

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So we want to know how much work does Brianna do while climbing the stairs to a height h=8m while she weighs F=425N and in t=6s. So work W is defined as Force F times distance h or: W=F*h. Since Brianna has to use the force that is equal to her own weight during her climbing the calculation is this: W=F*h=425N * 8m=3400J. The work she does is W=3400 J.
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