Physics
posted by Kristin .
The position vector r of a particle moving in an xy plane is given by [r = (6t^33t)i + (41t^4)j] with r in meters and t in seconds. What is the angle between the positive direction of the x axis and a line tangent to the particle's path at t = 3 s? Give your answer in the range of (180 degrees; 180 degrees].
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