An Object of Mass M Moving at Speed V Strikes

question 72

Multiple Choice

An object of mass m moving at speed v strikes and object of mass 2m which had been at rest. The first object bounces backward along its initial path at speed v. 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 1/2 mv².
• D) The kinetic energy increases by mv².

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