A bullet is fired through a board 8.0cm thick in such a way that the bullet\'s l

Question

A bullet is fired through a board 8.0cm thick in such a way that the bullet's line of motion isperpendicular to the face of the board. The initial speed of thebullet is 350 m/s and it emerges fromthe other side of the board with a speed of 250 m/s. (a) Find the acceleration of the bullet as itpasses through the board.
1 m/s2

(b) Find the total time the bullet is in contact with theboard.
2 s (a) Find the acceleration of the bullet as itpasses through the board.
1 m/s2

(b) Find the total time the bullet is in contact with theboard.
2 s

Explanation / Answer

(a)   you have   initialspeed,   final speed and distance. Use: .    final speed2 = intialspeed2   + 2 ad          or .     2502 = 3502   + 2 a 0.08 .       a =    -375000m/s2       (note:they may or may not want the minus sign... the question wasntclear... the minus just means the bullet slowed down) . (b)    time = change in speed /a =    -100 / -375000 =   2.67 x10-4 s

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