A bullet is fired through a board 12.0cm thick in such a way that the bullet\'s

Question

A bullet is fired through a board 12.0cm thick in such a way that the bullet's line of motion isperpendicular to the face of the board. If the initial speed of thebullet is 400 m/s and it emerges fromthe other side of the board with a speed of 300 m/s. Find the following. (a) The acceleration of the bullet as it passesthrough the board.
m/s2
(b) The total time the bullet is in contact with the board.
s (a) The acceleration of the bullet as it passesthrough the board.
m/s2
(b) The total time the bullet is in contact with the board.
s

Explanation / Answer

given thickness of the block is t = 12.0 cm the initial velocity of the bullet is U = 400 m/s the final velocity of the bullet is V = 300 m/s we have the relation    V 2 -U2 = 2 at so               a = ( V2 - U2 ) / 2t                         =---------------- m/s2 let the total time is   T then we have the realtionas                     V = U + a T                  T = ( V - U ) / a                    = ------------- s

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