A catapult with a radial arm 4.19 m long accelerates a ball of mass 19.1 kg through a quarter circle. The ball leaves the apparatus at 41.6 m/s. The mass of the arm is 22.6 kg and the acceleration is constant. Hint: Use the time-independent rotational kinematics equation to find the angular acceleration, rather than the angular velocity equation.
(a) Find the angular acceleration.
(b) Find the moment of inertia of the arm and ball.
(c) Find the net torque exerted on the ball and arm.