AP Physics 1· difficulty 4/5
A mass moving at collides elastically and head-on with an identical stationary mass. What are the velocities of the two masses after the collision?
Incoming continues at ; target stays at rest
Incoming stops; target moves at
Both move forward at
Both rebound at
Explanation
For 1D elastic collision with equal masses, the velocities are exchanged: incoming mass stops, target moves at .
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