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persamaan lenting sempurna : v1' - v2' = v2 - v1
tak lenting : v1'=v2'=v'
e= -(v2'-v1')
(v2-v1)
jika e 1 = tumbukan lenting sempurna
jika e 0 = tumbukan tak lenting sama sekali
jika 0 < e < 1 = tumbukan lenting sebagian