A 50 g 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.
a) What is the force exerted in the bullet.
b) What is the magnitude of the bullet's accelaration in m/s2 as it passes through the board?
c) How long does the bullet take to pass through it?