APFIVE Velocity Ratio in an Inelastic Collision
Two carts with masses $$m$$ and $$3m$$ collide on a frictionless track and stick together. If the final kinetic energy is $$\frac{1}{4}$$ of the initial kinetic energy, what was the ratio of their initial velocities ($$v_1/v_2$$)?
A
-1
B
3
C
1
D
-3
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