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m1v1+m2v2 = m1v1'+m2v2'
karena mulanya benda 2 diam maka v2=0
0.440 x 370 = 0,440v1' + 0,220v2'
eliminasi dengan persamaan lain
karena lenting sempurna maka e=1
e=-(v1'-v2')/v1-v2