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I know the right answer , but the explanation given makes no sense . The x- and y-coordinates of a moving particle are given by

I know the right answer , but the explanation given makes no sense .

The x- and y-coordinates of a moving particle are given by the parametric equations below. Find the magnitude and direction of the velocity for the specific value of t. Sketch the curve and show the velocity and its components. x = 3t, y =3 -t, t=5

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