A 10.0 kg block on a smooth horizontal surface is acted upon by two forces: a horizontal force of 70 N acting to the left and a horizontal force of 30 N to the right. The acceleration of the block will be
A. 10.0 m/s2 to the left.
B. 2.3 m/s2 to the right.
C. 4.0 m/s2 to the left.
D. 4.0 m/s2 to the right.
Answer: C
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