4. The cart of mass 10 kg shown above moves
without frictional loss on a level table. A 10 N
force pulls on the cart horizontally to the right.
At the same time, a 30 N force at an angle of
60° above the horizontal pulls on the cart to the
left. What is the magnitude of the horizontal
acceleration of the cart?

(A) 0.5 m/s2
(B) 1.6 m/s2
(C) 2.0 m/s2
(D) 2.5 m/s2
(E) 2.6 m/s2


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