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in Physics by (72.7k points)

A girl of mass 50kg climbs a flight of 100 stairs each measuring 0.25m in height, in 20s. Find 

(a) force acting on the girl 

(b) work done by the girl 

(c) gain in potential energy 

(d) power in (1) watts (2) Horse 

[Taking g = 10ms-2 , 1HP = 750W]

1 Answer

+1 vote
by (69.9k points)
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Best answer

mass = 50kg g = 10ms-1 

(a) Force acting on the girl F = mg 

F = 50 x 10 = 500N 

(b) Work done by girl W = F x S 

W = 500 x 25 = 12500J 

(c) Gain in pot. energy = mgh 

50 x 10 x 25 = 12500J

Or 

Gain in P.E. = Workdone = 12500J

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