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Average friction force(energy)

  • #1

Homework Statement



A 16 g bullet pierces a sand bag 13cm thick. If the initial bullet velocity was 51m/s and it emerged from the sandbag with 14m/s, what is the average magnitude of the friction force the bullet experienced while it traveled through the bag?

Homework Equations



k+u=k+u?

The Attempt at a Solution


I am completely stumped on this equation, i think my problem is that i keep thinking kinematics but i dont believe that is how we are supposed to solve it as we are currently working on energy
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
7
Work done due to frictional force = change in KE.
 
  • #3
lol thanks
 

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