1.

A crane pulls up a car of mass 500 kg toavertical height of 4 m. Calculate the work done by the crane.

Answer»

Solution :In order to RAISE the car, the CRANE has to do work against the force of GRAVITY. Therefore, the force REQUIRED to lift the car F = MG
`=500xx9.8=4900 N`
Displacement S = vertical height moved = 4 m. Work done W = F S = `4900 xx 4` = 19600 J


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