Force is required to lift a body from the ground to a height h and work is measured 
as the product of force and magnitude of displacement. 
a) Name the energy possessed by the body at maximum height. Write an equation for it. 
b) A man of mass 60 kg carries a stone of mass 20 kg to the top of a multi-storeyed building     of height 50m. Calculate the total energy spent by him? (9.8m/s2)

a). the energy possesed is gravitational potential enrgy .eqn for PE for mass m at height h U=mghb). total mass M=60+20=80 kg .h=50m.work done by the man =mgh=80*9.8*50=39200JRegards

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