12212112(/ )(/)aaFFam mFaa a===+++which yields a= 2.6 m/s2.79. The “certain force” denoted Fis assumed to be the net force on the object when it givesm1an acceleration a1= 12 m/s2and when it gives m2an acceleration a2= 3.3 m/s2.Thus, we substitute m1= F/a1and m2= F/a2in appropriate places during the following
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