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A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 4.80...

A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 4.80 cm.

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

(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.________s

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