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A girl of mass 40kg runs a height of 80 stairs, each 25cm high with a load of 20kg on her head in 25sec. If g is 10m/s^2, find:

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A girl of mass 40kg runs a height of 80 stairs, each 25cm high with a load of 20kg on her head in 25sec. If g is 10m/s2, find: 

(i) Gravitational force acting on the girl. 

(ii) Work done by her. 

(iii) Useful work done by her. 

(iv) Her power in watt.

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(i) Gravitational force acting on the girl = Her mass in kg x g

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