A 0.340 kg particle moves in an xy plane according to x(t)=-15.00+2.00t-4.00t^3 and y(t)=25.00+7.00t-9.00t^2, with x and y in meters and t in seconds. At t=0.700s, what are a.) the magnitude and b.) the angle (relative to the positive direction of the x axis) of the net force on the particle...