In an amusement park ride, a 100 kg car is released from rest at a height of 30 meters down a track that reaches ground level (0 meters) and rises back to compress a spring (k=1000 N/M) as it comes to rest finally at a height of 20 meters.
Is the car moving faster as it reaches 10 meters (down) or as it reaches ground level (0 meters)--assuming the track is frictionless? Why or why not?
