Physics
The centre of gravity of a sprinter during the race lies

Ahead of his feet
At the centre of the body
Behind his feet
To the left side of the body

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Physics
Railway tracks are banked on curves

to avoid frictional force between the tracks and wheels
the train may not fly off in the opposite direction
necessary centripetal force may be obtained from the horizontal component of the weight of the train
necessary centrifugal force may be obtained from the horizontal component weight of the train

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