The accleratingf the accelerometer system (#12 - 1230 kg) shown below can be measured from measuring the angle 8= 9.46 that the thread supporting the light ball (M - U.U15 kg) makes with the vertical by an observer riding on the platform. Find the hanging mass / 1. Note that the obersever riding on the platform measures the angle or the distance the ball from the observer remains the same while accelerating. Since the ball's distance from the observer does not change, the ball's velocity from him is zero and thus the acceleration of the ball from him is also zero (non-inertial reference frame, where F = ma works only with some correction that would be the same as the one from inertial frame). However, for another observer standing outside the system, the whole system and the ball are speeding up (acceleration is non-zero, non-inertial frame where F = ma works withyou any correction). m2 O a. 374.9 kg O b. 249.9 kg O c. 62.5 kg O d. none of these O e. 125 kg