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A cart full of groceries is rolling down from the top of a hill at a specific velocity. If the mass of this cart decreases

A cart full of groceries is rolling down from the top of a hill at a specific velocity. If the mass of this cart decreases to half of its initial mass and its velocity doubles (from its initial velocity) by the time it reaches the bottom of the hill, what can you say happens when comparing the momentum of the cart from the top of the hill to the bottom of the hill?

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