A man lifts a mass of 20 kg to a height of 2.5 m Assuming that the force of gravity on 1 kg mass is 10N, find the work done by the man. [2 marks]

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Solution

Answer:
Mass = 20 kg
h = 2.5 m
Force of gravity on a mass of 1 kg = 10 N
Force of gravityona mass of 20kg
F = mg = 20 × 10 = 200 N [1 mark]
Work done in lifting the mass to height h = 20 m is
W = F × h
= 200 N × 2.5 m
= 200 × 25/10 =500 J [1 mark]

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A man lifts a mass of 20 kg to a height of 2.5 m Assuming that the force of gravity on 1 kg mass is 10N, find the work done by the man. [2 marks]

Answer: Mass = 20 kg h = 2.5 m Force of gravity on a mass of 1 kg = 10 N Force of gravityona mass of 20kg F = mg = 20 × 10 = 200 N [1 mark] Work done in lifting the mass to height h = 20 m is W = F × h = 200 N × 2.5 m = 200 × 25/10 =500 J [1 mark]

Answer:
Mass = 20 kg
h = 2.5 m
Force of gravity on a mass of 1 kg = 10 N
Force of gravityona mass of 20kg
F = mg = 20 × 10 = 200 N [1 mark]
Work done in lifting the mass to height h = 20 m is
W = F × h
= 200 N × 2.5 m
= 200 × 25/10 =500 J [1 mark]