5. A 2-kg cart, traveling on a horizontal air track with a speed of 3 m/s, collides with a stationary 4-kg cart. The carts stick together. The impulse exerted by one cart on the other has a magnitude of:
(A) 0 N·s
(B)2 N·s
(C) 4 N·s
(D) 6 N·s
(E) 12 N·s.

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