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A student releases the spring on the back of a 2.1kg cart. After the launch, the spring returns to its natural length and the cart obtains a speed of 2.9m/s. The reference level is the ground the cart is on. Neglect any friction and drag impeding the motion.
List the energy types at the initial and final and whether work and loss (due to non-conservative forces) occur as well at the corresponding amounts of energy.
Initial = _____.
Work? yes or no, and amount (if any)
Loss? yes or no, and amount (if any)
Final = ____.
How much energy was stored in the spring?

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