An ice sled moves along a frictionless track. A partially completed energy-bar chart is shown below.
• Position A: KE bar = 3 units; PE bar = 5 units
• Position B: KE bar = ___ ; PE bar = 2 units
The total mechanical energy of the sled–track system is conserved. Which of the following best describes the kinetic-energy bar that must be drawn for Position B?
a) Shorter than at Position A and equal to 3 units
b) Shorter than at Position A and equal to 5 units
c) Taller than at Position A and equal to 6 units
d) Taller than at Position A and equal to 8 units