Question

A crane lifts a 200kg load at a steady velocity.It takes 12s to raise the load through 60m.

i) What is the power needed to lift the load if there is no friction?

ii) What is the power needed if the friction force is constant at 170N?
bobpursley
power=work/time=200(9.8)60/12 watts

if friction
power= (170*60) +power above

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