Answer:
(a) (i) As potential energy decreases with decreasing height,
the speed of the object will increase and hence its kinetic energy will
increase.
(ii) Total mechanical energy will remain constant.
It is based on the law of conservation of energy which
states that energy can neither be created nor be destroyed. It can only by
transformed from one form to another.
(b)1kWh = 3.6x106J
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