Consider two string-suspended balls, both with a mass of 0.15 kg. (Similar to the arrangement in Fig. 6.15, but with only two balls.) One ball is pulled back in line with the other so it has a vertical height of 10 cm, and is then released.

(a) What is the speed of the ball just before hitting the stationary one?
(b) If the collision is completely inelastic, to what height do the balls swing?

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