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A bullet is fired through a board 14 cm thick, with its line of motion perpendicular to the face of the board, if it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullets acceleration as it passes through the board?

A bullet is fired through a board 14 cm thick with its line of motion perpendicular to the face of the board if it enters with a speed of 450 ms and emerges wit class=