# A Girl of Mass 50 Kg Runs up a Flight of 40 Steps in 20 Seconds. If Each Step in 20 Cm High, Calculate the Power Developed by the Girl. (G= 10 Ms-2). - Physics

Numerical

A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).

#### Solution

Given, mass = 50kg

Total height traveled = 40 x 20 cm = 800 cm = 8 m

g = 10ms-2

time taken = 20s

work done = mgh = 50 x 10 x 8 = 4000 J

power = "work done"/"time taken" = 4000/20 = 200 "watt"

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#### APPEARS IN

Frank ICSE Class 10 Physics Part 2
Chapter 1 Force, Work, Energy and Power
Exercise | Q 10 | Page 59