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Can somebody check my work for this physics question?
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A 0.39 kg particle moves in an xy plane according to x(t) = - 15 4 t - 6 t3 and y(t) = 15 5 t - 7 t2, with x and y in meters and t in seconds. At t = 1.6 s, what are (a) the magnitude and (b) the angle (within (-180°, 180°] interval relative to the positive direction of the x axis) of the net force on the particle, and (c) what is the angle of the particle's direction of travel?
Here is what I've done so far. (I tried to do so as neatly as possible) http://imgur.com/8X7rW
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