K.C.S.E Physics Q & A - MODEL 2018PP1QN16

K.C.S.E Physics Q & A - MODEL 2018PP1QN16

(a) An electric crane uses 8.0 x10⁴ N of energy to lift a load of 2.0 X 10⁴N in 4s.
(i) Determine the;
I power developed by the crane,
II height to which the load is lifted,
III efficiency of the crane whose motor is rated 2.5 X 10⁴ W.
(ii) State two forms of energy transformation that lead to the crane’s inefficiency.
(b) A stone is dropped from the top of a building to the ground. On the axes provided, sketch a graph of potential energy against time for the stone.

answers