Question

If the force is f=-30 units and the acceleration is a=6 units, find the mass, m

Answer 1

by Newton second law F=ma
it is impossible to have the net force opposite of the accelration so It is either F=-30 and a=-6
or F=30 and a=6
solving for m
$m = \frac{f}{a}$
substituting
$m = \frac{ 30}{6} = 5$