Calculating Muzzle Speed with Embedded Bullet and Friction

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In summary, the conversation revolves around solving a problem involving a bullet embedding itself in a block of wood and calculating the muzzle speed of the bullet. The use of energy and momentum is suggested to solve the problem, but the presence of two masses and the coefficient of friction adds complexity. The person seeking help is struggling with applying the concepts they know to this particular problem.
  • #1
chris568
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i really need help with this- i partially understand it, but I'm not sure exactly how to do this problem.

a 44 g bullet strikes and becomes embedded in a 1.54 kg block fo wood placed on a horizontal surface just in front of the gun. if the coefficient of friction between the block and surface is equal to .28 and the impact drives the block a distance of 18 m before it comes to rest, what was the muzzle speed of the bullet?

can anyone help?
 
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  • #2
use energy and momentum. what collison happens?
 
  • #3
i realize that impulse equals force times the change in time, which equals momentum, but i don't know how to apply these when there are two masses, and the coefficient of friction is involved. in all my previous problems, the necessary info was less and easier... :-\
 

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