# Chapter 6 - Think and Explain: 69

The cart with twice the mass moves at half the speed of the less massive cart.

#### Work Step by Step

The initial momentum of the system is zero. Afterward, the carts have equal and opposite momentum vectors. $$(2m) (\frac{v}{2}) = mv$$ We see that the cart with twice the mass moves at half the speed of the less massive cart.

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