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Question(s) / Instruction(s):

7.80-g bullet moving at 510 m/s penetrates a tree trunk to a depth of 5.10 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.

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