Question

A student who weighs 500 newtons climbed the stairs from the first floor to the third floor, 15 meters above,
in 20 seconds.
a. How much work did she do?
b. What was her power?

Answer 1

work = 500 x 15 = 7500

power= (500x15)/ 20=375

Answer 2

Given that,

Weight of the student, W = F = 500 N

She climbed the stairs from the first floor to the third floor 15 meters above, h = 15 m

Time, t = 20 s

To find,

a. Work done

b. Her power

Solution,

(A) When she is climbing from the first floor to the third floor, work done by her s given by :

$W=mgh\\\\W=500\times 15\\\\W=7500\ J$

(B) Power is given by work done per unit time. So,

$P=\dfrac{W}{t}\\\\P=\dfrac{7500\ J}{20\ s}\\\\P=375\ W$

Learn more,

Work done

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