Answer to Question #23911 in Mechanics | Relativity for Donovan
V = (370[m/s] + 220[m/s])/2 = 295[m/s].
Assuming that the velocity of the bullet decreases linearly, it takes
T = 3.90[cm]/295[m/s] = 0.039[m]/295[m/s] = 1.322·10^(-4)[s]
seconds the bullet to pass through the board.
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