please aku mnt tolong bgt !! deadline tolong ya..

Konstanta pengganti
1 / ks₁ = 1 / ks₁ + 1 / ks₂
ks₁ = k₁k₂ / (k₁ + k₂)
      = (400 N/m)(600 N/m) / (400 N/m + 600 N/m) = 240 N/m
ks₂ = k₃k₄ / (k₃ + k₄)
      = (200 N/m)(800 N/m) / (200 N/m + 800 N/m) = 160 N/m
kp = ks₁ + ks₂
     = 240 N/m + 160 N/m = 400 N/m

Pertambahan panjang
Δx = mg / kp
     = (2 kg)(10 m/s²) / (400 N/m) = 0,05 m

Energi potensial
EP = 1/2 kp Δx²
      = 1/2 (400 N/m)(0,05 m)² = 0,5 J