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A cart is set rolling across a level tab...

A cart is set rolling across a level table , at the same speed on every trial. If it runs into a patch of sand, the cart exerts on the sand an average horizontal force of `6N` and travels a distance of `6 cm` through the sand as it comes to a stop. If instead the cart runs inton a patch of gravel on which the cart exerts an average horizontal force of `9 N` how far into the gravel will the cart roll before stopping?

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