Finding final Velocity given mass, force, and displacement

  • #1

Homework Statement



2.78 kg block is pulled (from rest) by a force (horizontal surface) of 15.8 N. The coefficient of kinetic friction is .106. What is the velocity after 2.88 m?

Homework Equations


fk=N(uk)
Vf=sqrt((2*W)/m



The Attempt at a Solution



I attempted to find the final velocity by first finding the work (w=Fx*deltax) and then plugging it into the Vf equation I have listed.
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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Hi Bearbull24.5! :smile:

(have a mu: µ and a square-root: √ and a delta: ∆ :wink:)
fk=N(uk)
Vf=sqrt((2*W)/m

I attempted to find the final velocity by first finding the work (w=Fx*deltax) and then plugging it into the Vf equation I have listed.

That should be ok (assuming that m is inside the bracket). :confused:

What figures did you get?
 
  • #3
I got 5.7 for the final velocity and a work of 45.504 N m
 
  • #4
Do I need to use the coefficient of kinetic friction for anything?
 
  • #5
tiny-tim
Science Advisor
Homework Helper
25,832
251

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