Q.

Assertion : An external force is required to keep a body in motion. 

Reason : If the net external force is zero, a body at rest continues to remain at rest and a body in motion continues to move with a uniform velocity.

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a

both assertion and reason are true and reason is the correct explanation of assertion.

b

both assertion and reason are true but reason is not the correct explanation of assertion.

c

assertion is true but reason is false.

d

both assertion and reason are false.

answer is B.

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Detailed Solution

An external force is required to keep a body in motion if it is at rest. 

Force is not compulsory to keep a body in motion.

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