Physics
A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle ?

Circle
Great circle
Hyper–parabolic
Parabolic

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Physics
Railway tracks are banked on curves

to avoid frictional force between the tracks and wheels
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
the train may not fly off in the opposite direction

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