Physics
What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

11.2 km/sec
21 km/sec
35 km/sec
18 km/sec

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Physics
Railway tracks are banked on curves

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
the train may not fly off in the opposite direction

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