Jacob places a 0.13-kg toy car next to a spring on a track. He moves the car backward to compress the spring 12.7 cm, cm above the starting position? Since Jacob greased the axles of the toy car, assume there is no friction. Jacob's previous then releases the car, propelling it upward along a curved track. How fast is the car going after it rises to a height of 46.9 experiments indicate that the spring has a force constant of 130 N/m.