A particle moves so that its position vector is given by , where is a constant. Which of the fo....

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A particle moves so that its position vector is given by , where is a constant. Which of the following is true?
(a) Velocity is perpendicular to and acceleration

is directed towards the origin.
(b) Velocity is perpendicular to and acceleration is directed away from the origin.
(c) Velocity and acceleration both are perpendicular to .
(d) Velocity and acceleration both are parallel to .
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