A 16.1-lb body is traveling in a horizontal straight line with a velocity of 12 ft/sec w...

A 16.1-lb body is traveling in a horizontal straight line with a velocity of 12 ft/sec when a horizontal force P is applied to it at right angles to the initial direction of motion. If P varies according to the accompanying graph, remains constant in direction, and is the only force acting on the body in its plane of motion, find the magnitude of the velocity of the body when t = 2 sec and the angle θ which the velocity makes with the direction of P.