Amy (180 lbs) and Rachel (90 lbs) are standing on slippery ice and push off each other. If Amy slides at 5 m/s, what speed (meaning, don't worry about the direction or sign) does Rachel have? Hint 1: Don't worry about converting the weights of Amy and Rachel to kilograms here. Think the ratio of weights is the same as the ratio of masses (weight is therefore in a ratio of weights, the "s" cancel out). Please give your answer in units of m/s, however, do not explicitly include units when typing your answer into the answer box. Including actual units will result in your answer being incorrectly scored.

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”