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18.
What is the acceleration of the box to the right assuming a frictionless surface?

 
   
A. 2.0 m/s2 to the right Sum of Forces = ma

Sum of Forces = 10.0 N - 6.0 N = 4.0 N to the right

     
       Sum of Forces        4.0 N
a = --------------------- = ------------- =  0.80 m/s2 to the right
               m                     5.0 kg

   
The Correct Answer is B.
B. 0.80 m/s2 to the right
C. 20. m/s2 to the right
D. 1.20 m/s2 to the left