Give the energy change in each of the folloeing cases:
(i) the unwinding of a watch spring
(ii) a loaded truck when started and set in motion
(iii) a car going uphill

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Solution

(i)
Muscular energy is converted into elastic potential energy of the spring.
(ii)
Chemical energy of the fuel is converted into kinetic energy of the truck.
(iii)
Chemical energy of the fuel is converted into potential energy of the car.

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