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Magnitude of bullet fired into gel 
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#1
Feb1310, 03:01 PM

P: 6

1. The problem statement, all variables and given/known data
A rifle bullet with a muzzle speed of 330 m/s is fired directly into a special dense material that stops the bullet in 25.0 cm. Assuming the bullet's deceleration to be constant, what is its magnitude? x=25.0cm V=330 m/s 2. Relevant equations ? 3. The attempt at a solution I don't fully understand the problem, to me it sounds like they want the magnitude of force exerted on the bullet in the opposite direction it was fired? I'm really confused. Thanks 


#2
Feb1310, 03:23 PM

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P: 6,038

No, they are looking for the magnitude of the bullet's acceleration (deceleration).



#3
Feb1310, 03:31 PM

P: 4

The initial speed, u, is 330m/s, the final speed, v is 0 m/s since the bullet comes to rest. The bullet travels a distance, s of 0.25m.
The equation of motion v^2=u^2 +2as should be of help. Note that this will give you a negative acceleration which is to be expected as it is opposing the direction of motion. 


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