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A small, 300 gg cart is moving at 1.40 m/sm/s on a frictionless track when it...

A small, 300 gg cart is moving at 1.40 m/sm/s on a frictionless track when it collides with a larger, 4.00 kg cart at rest. After the collision, the small cart recoils at 0.810 m/s.

What is the speed of the large cart after the collision?

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