Having trouble on number 5

4) In order to determine the moment of inertia / of a rotating platform, a string is wrapped around a spool of radius r = 2.0 cm beneath the platform. The string is then fed over a pulley with a hanging mass attached to its end as shown in the diagram below. The hanging mass is then released from rest, and its linear acceleration is measured. Rotation axis pulley Base M If the hanging mass is M = 100 g, and its linear acceleration is a = 2.5 m/s', what is the moment of inertia I of the rotating platform? a = 2.5 m /52 Ma-T-Ma M= 100g T= M ( q -a) M = 0. 1 Kg T - - 0. 1 ( 9 . 8 - 2.5) = 0.73N r = 0.02m * = Txr 0. 73 x 0. 02 : 0. 0146 Nm I = 0.0146 * 0.02 I = 11.68 x10# Kam 2.5 5) Using the same rotating platform as in problem 4, a ball of mass m = 50 g is launched into the catcher on top of the platform as shown in the diagram below. After the ball is caught by the catcher, the angular velocity of the system is w = 2.2 rad/s. Rotating track Base Ball Radius Launcher Catcher a. Before collision b. After collision If the catcher is R = 20 cm away from the axis of rotation of the platform, what is the linear velocity v of the ball before it is caught