A 0.10-kg cart traveling in the positive...

A 0.10-kg cart traveling in the positive x direction at 10.0 m/s collides with a 0.30-kg cart at rest. The collision is elastic. What is the velocity of the 0.10-kg cart after the collision?

`+2.5` m/s

`+5` m/s

`-2.5` m/s

`-5` m/s

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