Q.

To keep a particle (body) moving with constant velocity on a frictionless horizontal surface an external force

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a

should act continuously

b

should be a variable force

c

should not act

d

should act opposite to the direction of motion

answer is C.

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Detailed Solution

To keep the body moving with constant velocity on a friction less surface.

External force is not required because the body which is moving with constant velocity on a frictionless surface will continue to remain in same state of motion by virtue of its inertia.

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