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Nov 2016 p43 q1
3439
A crane is used to raise a block of mass 50 kg vertically upwards at constant speed through a height of 3.5 m. There is a constant resistance to motion of 25 N.
Find the work done by the crane.
Given that the time taken to raise the block is 2 s, find the power of the crane.
Solution
(i) The potential energy (PE) gain is calculated as: