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?

15V;+ 2v; = 150/+ 21
150,+ 2(0) = 1504+ 211
150,+ 2(0) = (15 + 2)
O 15V+ 2v,= (15 + 2)