Physics
Two stones of different masses are dropped simultaneously from the top of a building

Larger stone reaches the ground earlier
Both the stones reach the ground at the same time
Depends on the composition of the stone
Smaller stone reaches the ground earlier

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Physics
Railway tracks are banked on curves

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

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