Question

a boy of mass 55 kg runs up a flight of 40 stairs, each measuring 0.15m. calculate the work done by the boy.​

Answer 1

Answer:

220 and 0.29 is answer

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Answer 2

Explanation:

Given,

Mass of boy = 55 kg

No. of stairs = 40

Height of each stair = 0.15m

Total height covered by the boy = 0.15*40 = 6m

Since we know,

Potential energy is equal to the work done by the body .

P.E = m * g* h

where m is the mass of body

g is gravity

h is height

substituting the values

P.E = 55 * 10 * 6

P.E = 3300 J

So, the work done by the boy is = 3300 J .

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