A bullet is fired through a board 14.0 cm thick in such a way that the bullet’s line of motion is perpendicular to the face of the board.?

The initial speed of the bullet is 600 m/s and it emerges from the other side of the board with a speed of 500 m/s.

(a) Find the acceleration of the bullet as it passes through the board.

(b) Find the total time the bullet is in contact with the board.

Having trouble finding part B please help

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