What is the Average Friction Force Experienced by a Bullet Piercing a Sandbag?

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To find the average friction force experienced by a bullet piercing a sandbag, the problem involves calculating the change in kinetic energy as the bullet slows down. The bullet, weighing 16 g and traveling initially at 51 m/s, emerges from the 13 cm thick sandbag at 14 m/s. The work done by the friction force equals the change in kinetic energy of the bullet. The discussion highlights confusion regarding the appropriate equations, emphasizing the need to focus on energy principles rather than kinematics. Understanding the relationship between work, friction, and kinetic energy is crucial for solving this problem.
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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 don't believe that is how we are supposed to solve it as we are currently working on energy
 
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Work done due to frictional force = change in KE.
 
lol thanks
 

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