mohon dibantu, fisika kelas 11 bab elastisitas

1/k. seri
= 1/k + 1/2k + 1/k
= 2/k + 1/ 2k
= 4k+ k / 2k²
= 5k / 2k²
= 5/ 2k

k seri = 2k/5


k par
= k + 2k + k
= 4k


k.seri : k.par
= 2k / 5 : 4k
= 2k : 20 k
= 1 : 10

=> Jawaban : D

gambar kiri: 3 pegas tersusun seri
1/kₛ = 1/k + 1/(2k) + 1/k
1/kₛ = (2+1+2) / (2k)
1/kₛ = 5/(2k)
kₛ = 2k/5

gambar kanan : 3 pegas tersusun paralel
kₚ = k + 2k + k
kₚ = 4k

perbandingan ki ka
kₛ : kₚ = 2k/5 : 4k
kₛ : kₚ = 2k : 20k
kₛ : kₚ = 1 ; 10

perbandingan ka ki
kₚ : kₛ = 4k : 2k/5
kₚ : kₛ = 20k : 2k
kₚ : kₛ = 10 : 1

soal ambigu ?? !! ??