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A 300 g hockey puck is shot across an ice-covered pond. Before the hockey puck was hit, the
puck was at rest. After the hit, the puck has a speed of 40 m/s. The puck comes to rest after
going a distance of 30 m. (a) Describe how the energy of the puck changes over time, giving
the numerical values of any work or energy involved.

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