To keep a body moving with constant velocity on a frictionless surface, an external force:
should act continuously
should be a variable force
is not required
should act opposite to the direction of motion
A
should be a variable force
B
should act continuously
C
is not required
D
should act opposite to the direction of motion
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Solution
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The question is based on Newton's first law of motion. There is no external force required in case of constant velocity, where frictional forces are zero.
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