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particle moves along a path and its speed increases with time. In which of the following cases are its acceleration and velocity vectors perpendicular everywhere along the path? (a) the path is circular (b) the path is straight (c) the path is a parabola (d) never.​

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Answer:

a

Explanation:

a) the path is circular

for circular moment, there is a centripetal force always perpendicular to the direction of movement (velocity)

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