Positive SSL
1 如圖所示的彈簧系統,彈簧常數K1=K2=K3=2(N/cm),則等值彈簧常數為
A 1(N/cm)
B 2/3 (N/cm)
C 4/3 (N/cm)
D 1/4 (N/cm)

K1K2先並聯再與K3串聯

K1K2並聯=2+2=4(N/cm)

再跟K3串聯K=(4×2)(4+2)=4/3 (N/cm)