Meriam, Kraige & Bolton — Kinetics of Particles: Problem 3_93

3/93 The resistance $R$ to penetration $x$ of a 0.25-kg projectile fired with a velocity of 600 m/s into a certain block of fibrous material is shown in the graph. Represent this resistance by the dashed line and compute the velocity $v$ of the projectile for the instant when $x = 25$ mm if the projectile is brought to rest after a total penetration of 75 mm.