Question

12. A boy of mass 70 kg, run up a flight of 50 stairs, each measuring 0.20m in 20 s. Calculate,

(i) Force acting on the body (ii) Work done by the body (g = 10ms–2)
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Answer 1

Answer:

hey mate I don't know the answer but there's an example for you

Explanation:

Given, mass of the boy, m=40kg ;

total height gained, h=50×10cm

                                   =500cm=5m

time taken to climb, t=5s

Work done by the boy,

W=mgh=(40)(10)(5)=2000J

Power developed, P=  

t

W

​  

=  

5

2000

​  

=400W