To keep a body moving with a constant velocity on a frictionless surface, the net force:

Should be of variable magnitude

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Should act continuously

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Should be zero

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Should act opposite to direction of motion

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Solution

The correct option is C Should be zero
Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
So for a body to move at constant velocity the net force should be zero.

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To keep a body moving with a constant velocity on a frictionless surface, the net force:​

To keep a body moving with a constant velocity on a frictionless surface, the net force: