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    				| 1. | Two balls having masses m and 2m are fastened to twolight strings of same length l (figure 9-E18). The otherends of the strings are fixed at O. The strings are keptin the same horizontal line and the system is releasedfrom rest. The collision between the balls is elastic. (a)Find the velocities of the balls just after their collision(b) How high will the balls rise after the collision?2m | 
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