An Object of Mass M Moving at Speed V₀ Strikes

question 55

Multiple Choice

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?

• A)The collision is elastic.
• B)The kinetic energy decreases by mv².
• C)The kinetic energy decreases by mv².
• D)The kinetic energy increases by mv².

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