# Physics

A 7.80-g bullet moving at 590 m/s penetrates a tree trunk to a depth of 4.8 cm. Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.

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1. Vo=0
7.80g=.0078kg
V=590m/s
d=.048m

W/d
W=Fd
=1/2mV^2 - 1/2m(Vo)^2

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2. Forgot to clarify W/d is the total Force. Where W=KE=1/2mV^2

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