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20. Billiаrd bаll A mоving with speed 3m/s in the +x directiоn аs in fig. strikes an equal-mass ball B initially at rest. The twо balls are observed to move off at 450 to the x axis, ball A above the x axis and ball B below. That is,ϴ’A =450 and ϴ’B =-450 in Fig. What are the speeds of the two balls after the collision?