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## Homework Statement

Jack and Jill are maneuvering a 3570kg boat near a dock. Initially the boat's position is [PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png2,0,9[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngm [Broken] and its speed is 4.6m[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmmi10/alpha/144/char3D.pngs. [Broken] As the boat moves to position [PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png12,0,0[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngm, [Broken] Jack exerts a force of [PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png-80,0,290[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngN, [Broken] and Jill exerts a force [PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png0,240,0[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngN. [Broken]

What is the final speed of the boat?[/B]

## Homework Equations

W=Fd

Kfinal = Kinitial +W

KE=(1/2)mv^2[/B]

## The Attempt at a Solution

1) Final total work

Jack Work = (-80*10)+(0*0)+(290*-9) = -3410

Jill Work = 0

(It says my Work is correct)

2) Kfinal = Kinitial + W

Kinitial = (1/2)(3570)(4.6)^2 = 37770.6

Kfinal = 37770.6+(-3410)

Kfinal = 34360.6

3) Final Velocity = KE/m

**34360.6/3570 = 9.6248m/s**

Not sure where my error is... any help would be appreciated!

Not sure where my error is... any help would be appreciated!

[/B]

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