Answer:
Both the situations are
possible.
(a) When an object is
projected upwards, its velocity at the topmost point is zero even though the
acceleration on it is 9.8 ms~2 (= g). Also, this situation is possible when the
body is at rest (constant acceleration but with zero velocity in this case).
(b) When a
stone tied to a string is whirled in a circular path, the acceleration but acting
on it is always at right angles, i.e., perpendicular to the direction of motion
of stone.
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