In which of the following cases forces may not be required to keep the – McqOptions

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1.	In which of the following cases forces may not be required to keep the [AIIMS 1983]
A.	Particle going in a circle
B.	Particle going along a straight line
C.	The momentum of the particle constant
D.	Acceleration of the particle constant
Answer» D. Acceleration of the particle constant

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