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Question
An object may have
(a) varying speed without having varying velocity
(b) varying velocity without having varying speed
(c) nonzero acceleration without having varying velocity
(d) nonzero acceleration without having varying speed.
Solution
(b) varying velocity without having varying speed
(d) nonzero acceleration without having varying speed
Velocity and acceleration are vector quantities that can be changed by changing direction only (keeping magnitude constant).
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