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Magnitude of Force

  • Thread starter cthionic
  • Start date
  • #1
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Homework Statement


"A force was used to push a 10 kg object through a distance of 11 metres. Its speed was initially 2 m/s, and was increased to 5.2 m/s at the end of the 11 metres. What was the magnitude of the force?"


Homework Equations


Ek = 1/2 mv^2
W = fd?

The Attempt at a Solution



Initial kinetic energy was 20, final = 143. 123 J of work went into the system. Unsure of what to do from here, or if that was the correct approach. We're reviewing "work and energy" chapter in class, so I would assume it would be along those lines. multiple choice options are 10.5 N, 115 N, 230 N, 23 N.
 

Answers and Replies

  • #2
Nugatory
Mentor
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You know the amount of work that was done and you know the distance the force acted to do that work.
 
  • #3
5
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Oops. I see my mistake, I was dividing 123 by 11, 143 J at 5.2m/s isnt correct, it's actually 135. Thanks.
 

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