1973M2. A 30 -gram bullet is fired with a speed of 500 meters per second into a wall.
(a) If the deceleration of the bullet is constant and it penetrates 12 centimeters into the wall, calculate the force on the bullet while it is stopping.
(b) If the deceleration of the bullet is constant and it penetrates 12 centimeters into the wall, how much time is required for the bullet to stop?
(c) Suppose, instead, that the stopping force increases from zero as the bullet penetrates. Discuss the motion in comparison to the case for a constant deceleration.