An object of mass m moving at speed v0 strikes an object of mass 2m which had been at rest. The first object bounces backward along its initial path at speed v0. Is this collision elastic, and if not, what is the change in kinetic energy of the system? The collision is elastic. The kinetic energy decreases by mv02. The kinetic energy decreases by ½ mv02. The kinetic energy increases by mv02.

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