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A particle moves along a straight line. ...

A particle moves along a straight line. Its velocity and speed are denoted by `v_1` and `v_2`. The quantity `(v_1)/(v_2)`

A

must be equal to 1

B

must be equal to -1

C

can be any positive number

D

must be either +1 or -1

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The correct Answer is:
D
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