Problem 9 A 0.35 kg plastic cart and a 18 kg steel cart can both roll without friction on a horizontal surface. Equal forces are used to push both carts forward for a time of 1.0 second, starting from rest. After the force is removed at t = 1.0 s, is the momentum of the plastic cart greater than, less than, or equal to the momentum of the steel cart? Explain.

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