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= 80-120
= - 40 N (- gaya keatas)
resultan = 40 N
b. ΣF = m.a
-40 = 8.a
a = -5 m/s²
c. tanda '-' --> benda terangkat ke atas dengan resultan 40N
3. W= m.g --> g=10
W = 10m
W₁ = 10. 0,5 = 5N
W₂ = 10. 2 = 20 N
W₃ = 10. 10 = 100 N
4. W = m.g
= 50.10
= 500 N
5. gb = 1/6 gB
= 1/6. 10
= 10/6
= 5/3
Wb = m. gb
= 6 . 5/3
= 10 N