Newton's Second Law for a Single Force

AI Thread Summary
To determine the minimum strength required for a fishing line to stop a salmon weighing 85 N in 11.6 cm while initially moving at 3.0 m/s, the acceleration was calculated to be -38.7931 m/s². The mass of the salmon was found to be approximately 8.673 kg. Using Newton's second law, the force was calculated as F = ma, resulting in a force of -336.45 N. The negative sign indicates a direction opposite to the salmon's drift velocity, suggesting the fishing line's tension must be positive to effectively stop the fish. The calculations highlight the importance of direction in force applications in physics problems.
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Homework Statement


Stopping a Salmon 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 salmon of weight 85 N in 11.6 cm if the fish is initially drifting at 3.0 m/s? Assume a constant acceleration.


Homework Equations


X1= -0
X2= .116
V1 = 3.0
V2= 0
A = unknown
T = unknown
T =

The Attempt at a Solution


Solved for A and found it to be -38.7931

m = 85 / 9.8


F = ma
F= (8.673)(-38.793)
F = - 336.45
Not sure what i did wrong
 
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Fishing line may not be in the direction of drift velocity of salmon.
 
so that would swithch the sign to positive then
 

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