# A 7.80 - g bullet moving at 575 m/s penetrates a tree trunk toa depth of 5.50 cm. (a) Use work and energy considerationsto find the average frictional force that stops the bullet.(b) Assuming the frictional force is constant, determine howmuch time elapses between the moment the bullet enters thetree and the moment it stops moving.

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A 7.80 - g bullet moving at 575 m/s penetrates a tree trunk to
a depth of 5.50 cm. (a) Use work and energy considerations
to find the average frictional force that stops the bullet.
(b) Assuming the frictional 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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Step 1

(a)

The equation for the work done in terms of force is

Step 2

Substituting the values gives

Step 3

(b)

The acceleration in ...

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