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An object feels two forces : one of magn...

An object feels two forces : one of magnitude 8 N pulling to the left and one of magnitude 20 N pulling to the right. If the object's mass is 4 kg what is its acceleration ?

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Forces are represented by vectors and can be added an subtracted. Therefore, an 8 N force to the left added to a 20 N force to the right yields a net force of 80-8 = 12 N to the right. Then Newton's Second Law gives `a= F_("net")//m=(12 N " to the right ")//(4kg)=3 m//s^(2)` to the right.
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