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OpenStudy (anonymous):
Use work and energy to find the average friction force that stops a bullet with a mass of 7.8kg, v1=575 m/s, x=5.5cm.
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OpenStudy (vijay):
81545.4545 N (Newton )
OpenStudy (anonymous):
The answer in the back of the book is 2.34x10^4N. I got Wnet=KEf-KEi=Average Friction. I got \[-FkDeltax = 1/2mVf ^{2}-1/2mVi ^{2}\]. Then, I isolated -Fk. But I don't know how to find the Vf.
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