A ballistic pendulum is a device that can be made to measure projectile velocity. The pendulum is constructed in such a way that the projectile is fired at the bob of the pendulum (usually a wooden block) which is then swung around as illustrated in the Figure above, with the projectile embedded in it. By measuring the height reached by the pendulum bob, one can determine the projectile's velocity before colliding with the pendulum. If a ballistic pendulum of mass M is suspended from the end of the observed string, it is seen that it has risen as high as ℎ after being hit by a bullet of mass m. If m = 5kg, M = 10kg, g = 10 m / s2, and h = 5m. How fast is the bullet moving?

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