Assume that a 1.00-kg ball is thrown solely by the action of the forearm, which rotates about the elbow joint under the action of the triceps muscle, fig. 8-45. the ball is accelerated uniformly from rest to 10.0 m/s in 0.350 s, at which point it is released. calculate (a) the angular acceleration of the arm, and (b) the force required of the triceps muscle. assume that the forearm has a mass of 3.70 kg and rotates like a uniform rod about an axis at its end.