A fisherman yanks a fish out of the water with an acceleration of 5.2 m/s2 using a very light fishing line that has a "test" value of 31 N. The fisherman unfortunately loses the fish as the line snaps. What is the minimum mass of the fish?

Just use F = ma!

It's more complicated than that but I'm not sure what level you're at.

Is F=ma the kind of level you're at?