30 POINTS: Jimmy kicks a ball off the top of his unusually tall school, which flies off with no vertical velocity. If the ball lands 50 meters from the edge of his school, and if the school is 600 meters tall, how fast was the rock kick off the building? (SHOW WORK!)

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to: