A bullet enters a wooden plank with a speed of 300m s−1 and emerges from the other side with a speed of 180m s−1. The length of the path inside the plank is 15cm. Assume that the deceleration of the bullet inside the wood is uniform.
(i) Calculate the magnitude of the deceleration of the bullet inside the plank.
(ii) Find the minimum thickness of a similar plank required to bring the bullet to rest.
(iii) Determine the time interval for which the bullet is inside the 15cm plank.