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◾ Materi : Barisan dan Deret◾ Sub materi : Deret
◾ Mapel : Matematika
◾ Keyword : Deret Geometri Tak Hingga
Jawab :
*Tinjau pantulan kebawah
Panjang pantulan kebawah = 15 m
r = 4/5
S~ = a/(1-r) = 15/(1-4/5) = 15/(1/5) = 75 m
*Tinjau pantulan keatas
Panjang pantulan keatas = 15m x 4/5 = 12 m
S~ = a/(1-r) = 12/(1-4/5) = 12/(1/5) = 60 m
Panjang lintasan total = 75 m + 60m = 135 m
Jawaban : C
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