(Solved): 7- EXAMPLE 7-9 Ballistic pendulum. The ballistic pendulum is a device used to measure the speed of ...

7- EXAMPLE 7-9 Ballistic pendulum. The ballistic pendulum is a device used to measure the speed of a projectile, such as a bullet. The projectile, of mass m. is fired into a large block (of wood or other material) of mass M, which is suspended like a pendulum. (Usually, M is somewhat greater than m.) As a result of the collision, the pendulum and projectile together swing up to a maximum height h, Fig. 7-16. Determine the relationship between the initial horizontal speed of the projectile, v, and the maximum height h. M+m C M UM=0 (b) (a) FIGURE 7-16 Ballistic pendulum. Example 7-9. 8- =45° B FIGURE 7-19 Example 7-11. EXAMPLE 7-11 Billiard ball collision in 2-D. Billiard ball A moving with speed VA = 3.0 m/s in the +x direction (Fig. 7-19) strikes an equal-mass ball B initially at rest. The two balls are observed to move off at 45° to the x axis, ball A above the x axis and ball B below. That is, 0 = 45° and = -45° in Fig. 7-19. What are the speeds of the two balls after the collision? 8 <=-45°