A lab cart with a mass of 15 kg is moving with constant velocity, v, along a straight horizontal track. A student drops a 2 kg mass into it from directly above, and the cart continues moving. Which equation best represents the horizontal momentum in this situation? 15vi 2vi = 15vf 2vf 15vi 2(0) = 15vf 2vf 15vi 2(0) = (15 2)vf 15vi 2vi = (15 2)vf.
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