Question

A girl whose mass is 20 kg climbs up 25 steps each of height 15 cm in 10 sec. Calc the power expended.

Answer 1

height of 1 stair *no. of stairs =height climbed = 3.75m

time =10

acceleration =gravity= 10m/s² downwards

mass =20 kg

power , i forgot formula

Answer 2

Given that,

Mass of the girl, m = 20 kg

She climbs up 25 steps each of height 15 cm in 10 sec.

To find,

Power experienced by girl.

Solution,

It is mentioned that the she climbs up 25 steps each of height 15 cm. It means she covers a distance of 375 cm. The rate at which work is done is called power experienced by the girl.

$P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{20\times 9.8\times 3.75}{10}\\\\P=73.5\ W$

So, the power experienced by the girl is 73.5 watts.

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