Physics
In which of the following cases, kinetic energy is being used in performing work ?

Driving a car to cover a distance
Rowing a boat in the lake
Paddling the bicycle to cover a distance
Wind mill grinding wheat grain

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Steel can be saved
Accidents due to expansion in summer can be avoided
Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train

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