Q1. Heather and Jerry are standing on a bridge 46 above a river. Heather throws the rock straight down with a speed of 20. Jerry, at accurately the same instant of time, throws a rock straight up with the same speed. Overlook air resistance.
Q2. A 210, 48.0 cm diameter turntable rotates on frictionless bearings at 54.00. A 17.0 block sits at the center of the turntable. A compressed spring shoots the block radically outward along a frictionless groove in surface of the turntable.