A Railroad Car of Mass M and Speed V Collides

question 62

Multiple Choice

A railroad car of mass m and speed v collides and sticks to an identical railroad car that is initially at rest. After the collision, the kinetic energy of the system

• A) is the same as before.
• B) is half as much as before.
• C) is one third as much as before.
• D) is one fourth as much as before.
• E) is one quarter as much as before.

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