A 0.340 kg particale moves in an xyplane according to x(t)= -15 + 2t - 4t3 and y(t) = 25 + 7t - 9t2, with x and y in metersand t in seconds. At t= 0.7s, what are: (a) The magnitude. (b) The angle (relative to the positive direction of thex-axis) of the net force on the particale. (c) What is the angle of the particle's direction oftravel?