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A weightlifter is lifting weights of mass 200kg up to a height of 2 meters. If g = 9.8 m/s2, calculate: 

a) potential energy acquired by the weight 

b) work done by the weightlifter

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Mass, m = 200 kg 

Height, h = 2m 

Acceleration due to gravity, g = 9.8 m/s2 

a) Potential energy = mgh = 3920 J 

b) Work done against gravity = potential energy gained by the weight 

Therefore, work done, W = mgh = 3920 J

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