48. This problem involves both mechanical energy conservation UKKi=+12, where Ui= 60 J, and momentum conservation 0112 2mvGGwherem2= 2m1. From the second equation, we find | || |GGvv2=which in turn implies (since=||Gand likewise for v2)KmvmvmvK1222222121212122==FHG
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