Answers

2014-06-13T09:28:26+08:00
Given: F1=5N
          F2=-4N
          m=8kg
F1 is to the right(+), F2  to the left(-)
F=F1+F2
  =5+(-4)=1
therefore, F=m/a
a=F/m
  =8kg/1N
  =8kg=8000g

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2014-06-13T13:53:54+08:00
Credits to Queenz..answer is 8 but the unit sholud me m/s

so acceleration is 8 meter per second
 
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