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# physics help for grade 12 please?

a spy code named 001 uses a pulley to lower another spy, code named 002, on a harness down from the roof of a building at a constant speed. The mass of spy 002 is 65kg, and the building is 100.0m high.

a) calculate the work done on spy 002 by spy 001

b)calculate the work done by spy 002 by the force of gravity

c)calculate spy 002's kinetic energy when she is lowered at a speed of 2.5 m/s down the side of the building

d) determine the change in spy 002's gravitational potential energy when she reaches the ground

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