14. Two lab carts are on a frictionless track, attached by a spring, shown above. The carts are
pushed together by a physicist, therefore compressing the spring fully. The physicist lets go of the carts
and they move in opposite directions after the spring extends. Which of the following happens to the
cart/spring system after the carts are released?
a. The energy of the system decreases
b. The energy of the system remains constant
c. The momentum of the system increases
d. The momentum of the system remains constant.
Answers: 3
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14. Two lab carts are on a frictionless track, attached by a spring, shown above. The carts are
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