9709 P43 - Nov 2016 - 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.
