mohon bantuan nya kawan2

1. xo = 15 cm, x = 20 cm, F = 25 N
pertambahan panjangnya
Δx = x - xo = 5 cm = 0.05 m

F = k Δx
k = F/Δx = 25 / 0.05 = 500 N/m

2. pegas disusun seri
1/k.total = 1/k1 + 1/k2 + 1/k3
1/k.total = (1/1200) + (1/600) + (1/400)
1/k.total = (1 + 2 + 3)/1200
1/k.total = 6/1200
maka
k.total = 1200/6 = 200 N/m