Question

3. In which of the following cases forces may not be required to keep the
a) particle going in a circle
b) particle going along a straight line
c) momentum of the particle constant
d) acceleration of the particle constant
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Answer 1

Answer:

Thus there is only one situation when no force is required to maintain the momentum of a moving particle constant. This situation is the case of a body moving in a straight line path without friction. So option is correct in one situation only (which the question has not clearly specified) and is wrong in general.

Explanation:

answer is momentum of the constant particle

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