A carpenter carries his 8kg toolbox at constant speed up 2 flights of stairs, each 3m high, in one minute.
a) How much work did the carpenter do in carrying the toolbox up 2 flights?
b) By how much did the potential energy of the toolbox change?
c) What was the carpenter's power output in watts when he carried the toolbox up the 2 flights?
d) If in leaning over the railing, the carpenter's glasses fall off, what will be the velocity of the glasses just before they hit the landing one flight down?