Meriam, Kraige & Bolton — Kinetics of Particles: Problem 3_168

3/168 The ballistic pendulum is a simple device to measure projectile velocity \( v \) by observing the maximum angle \( \theta \) to which the box of sand with embedded projectile swings. Calculate the angle \( \theta \) if the 2-oz projectile is fired horizontally into the suspended 50-lb box of sand with a velocity \( v = 2000 \text{ ft/sec} \). Also find the percentage of energy lost during impact.