1 A crane is used to raise a block of mass 600 kg vertically upwards at a constant speed through a height of 15 m . There is a resistance to the motion of the block, which the crane does 10000 J of work to overcome.
- Find the total work done by the crane.
- Given that the average power exerted by the crane is 12.5 kW , find the total time for which the block is in motion.