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[" A particle moves so that its position...

[" A particle moves so that its position vector is given by "],[vec r=cos omega that x+sin omega that y" .Where "omega" is a constant.Which of the "],[" following is true? "],[" (a) Velocity and acceleration both are perpendicular to "vec r],[" (b) Velocity and acceleration both are parallel to "vec r],[" (c) Velocity is perpendicular to "vec r" and acceleration is "],[" directed towards the origin "],[" (d) Velocity is perpendicular to "vec r" and acceleration is "],[" directed away from the origin."]

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