Question

The tension at which a fishing line snaps is commonly called the line's strength .what minimum strength is needed for a line that is to stop a 19 lb salmon in 4.4in.if the fish is intitially drifting at 9.2ft/s?Assume a constant deceleration

Answer 1

find the decelleration rate use eqns of constant acc to find it
then m*g-T=m*a
find T
a is decellaration

Answer 2

start by converting everything to SI.
8.62kg fish
.112m of distance traveled
2.8m/s initial velocity
0m/s final velocity

velocity(final)^2=velocity(initial)^2 +2a(change in x)
velocity(final)^2-velocity(initial)^2=2a(change in x)
(velocity(final)^2-velocity(initial)^2)/(2(change in x))=a
(0-(2.8)^2)/(2(.112)=a
35m/s^2=a

F=ma

F = 8.62 * 35m/s^2
F = 301.7 N

same thing in given(not SI) units

approx 183 ft/lb (I think)

staying with SI units is probably your best bet