You should solve this like you would any algebraic expression. Divide both sides by acceleration (a) and you will isolate the mass (m) to one side. Now divide the force (f) by acceleration (a).
F/a=m
m=F/a,,,,,,just divide a to the other side
To isolate mass m from the equation f = ma , divide both sides by the acceleration a . This gives m = a f , indicating that mass equals force divided by acceleration. This demonstrates a fundamental principle of Newton's Second Law of Motion.
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