A9.50-g bullet, moving horizontally with an initial speed
Chapter 13, Problem 84(choose chapter or problem)
A9.50-g bullet, moving horizontally with an initial speed , embeds itself in a 1.45-kg pendulum bob that is initially at rest. The length of the pendulum is . 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 bulletbob 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 long does it take for the bulletbob system to come to rest for the rst time?
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