15-39 Kinetics of Particle: Law of Conservation of Momentum (Chap 15: Dynamics) Engineers Academy

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Chapter 15: Kinetics of a Particle : Impulse and Momentum
Law of Conservation of Momentum
Hibbeler Dynamics 14th edition

15–39. A ballistic pendulum consists of a 4-kg wooden block originally at rest, u = 0°. When a 2-g bullet strikes and becomes embedded in it, it is observed that the block swings upward to a maximum angle of u = 6°. Estimate the initial speed of the bullet.

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Engineering Mechanics Dynamics
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how do you know energy is conserved between 2 and 3 and not 1 and 3?

moosman