Answer
310 N
Work Step by Step
The salmon weighs 85N, meaning that Fg = 85 = M *g so the mass of the fish is 8.7kg. The fish is initially moving at 2.8 m/s and it slows to a stop (0 m/s) in a distance of 11cm, or 0.11m.
We use
$v^2 = v_{0}^2 + 2a\Delta x$ to find the acceleration and we find that to be $a = -35.6 m/s^2$
Since F = ma then F = 310N
