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Question

A girl of mass 50kg climbs a flight of 100 stairs each measuring 0.25m in height, in 20s. Find the force acting on the girl. [Take g = 10ms2]


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Solution

Given:

Mass of girl=50kg

No. of stairs=100

Height of one stair=0.25m

Time =20s

g=10ms2

Analyzing problem:

Force acting on the girl = Weight of the girl

Formula used: f=W=mg

f=50×10

=500N

Hence, 500N force is acting on the girl.


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