If an object is moving in a straight line, then (a) the directional aspect of vector can be spec...

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If an object is moving in a straight line, then
(a) the directional aspect of vector can be specified by \( + \) ve and - ve signs
(b) instantaneous speed at an instant is equal to the magnitude of the instantaneous velocity at that instant
(c) Both (a) and (b)
(d) Neither (a) nor (b)
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