In which of the following cases force may not be required to keep the

1.	In which of the following cases force may not be required to keep the
A.	particle going on the circle
B.	Particle going along a straight line
C.	Momentum of the particle constant
D.	Acceleration of the particle constant
Answer» C. Momentum of the particle constant

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In which of the following cases force may not be required to keep the

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