Question

A particle moves along a path and its speed increases with time

A particle moves along a path and its speed increases with time.
(a) In which of the following cases are its acceleration and velocity vectors parallel?
the path is a parabola
the path is circular
never
the path is straight

(b) From the same choices, in which case are its acceleration and velocity vectors perpendicular everywhere along the path?
never
the path is straight
the path is a parabola
the path is circular

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