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Brianh1
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Homework Statement
A rifle with a barrel length of 55 cm fires a 8 g bullet with a horizontal speed of 390 m/s. The bullet strikes a block of wood and penetrates to a depth of 15 cm.
A) What resistive force (assumed to be constant) does the wood exert on the bullet?
B) How long does it take the bullet to come to rest?
Homework Equations
Vf = Vo + (a*t)
Xf = Xi + (Vo*t) + (1/2)a(t^2)
Vf^2 = Vo^2 + 2*a*d
F of friction = u*N
The Attempt at a Solution
(I'm really at a lost and I'm not understanding how to approach this problem.)