2 A 1000 kg cart is rolling to the right at 5.0 m/s. A 70 kg man is standing on the right end of the cart. He suddenly runs to the left with a speed of 10 m/s relative to the cart. What is the speed of the cart after the man starts running?
(A)8.65 m/s
(B)4.65 m/s
(C)7.65 m/s
(D)6.65 m/s
(E)5.65 m/s

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