A sports car moving at constant velocity travels 120m in 5.0s. If it then breaks and comes to a stop in 4.0s, what is the magnitude of its acceleration (assumed constant) in m/s^2, and in g's (g= 9.80 m/s^2)?

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.