A projectile is fired from 3 meters height above level ground with an initial velocity equals to 20 m/s and at an angle equals to 30 degrees above the horizontal level. Note that the air resistance is neglected. the position of a particle with respect to time is defined by: r(t) = rcos(cot )i +rsin(cot)j , where w and r are constants. Demonstrate that the magnitude of the acceleration of the particle is constant.

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Projectile Motion