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r = 4/5
a = 4/5 (2) = 8/5
s~ = a/(1-r) = (8/5) /(1/5) = 8
Panjang lintasan = So + 2 S~ = 2 + 2(8) = 18 m
atau
Panjang lintasan = (5+4)/(5-4) x 2 m = 9(2) = 18m (Jawaban C)
r = a/b = 4/5
Panjang lintasan bola sampai berhenti
PL= (a + b) / |a-b| x h
PL = (4 + 5) / |4 - 5| x 2
PL = 9 / 1 x 2
PL = 18 m