Chapter 13, Problem 79GP

Predict/Calculate A 9.50-g bullet, moving horizontally with an initial speed V₀, embeds itself in a 1.45-kg pendulum bob that is initially at rest. The length of the pendulum is L = 0.745 m. After the collision, the pendulum swings to one side and comes to rest when it has gained a vertical height of 12.4 cm (a) Is the kinetic energy of the bullet–bob system immediately after the collision greater than, less than, or the same as the kinetic energy of the system just before the collision? Explain. (b) Find the initial speed of the bullet. (c) How much time does it take for the bullet–bob system to come to rest for the first time?