A 780-g bullet moving at 650 ms penetrates a tree trunk to


A 7.80-g bullet moving at 650 m/s penetrates a tree trunk to a depth of 5.4 cm.

(a) Use work and energy considerations to find the average frictional force that stops the bullet.

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(b) 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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Physics: A 780-g bullet moving at 650 ms penetrates a tree trunk to
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