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Verified answer
• Hk. II Newtonα = 60° ⇒ cos α = ½
g = 10 m/s² ... anggap
a = __ ?
Fₓ = F cos α
Fₓ = 270 × ½ = 135 N
Menurut Hk. II Newton :
∑ F = (∑ m) a
135 - (0,3 × 10 × 10) - (0,3 × 10 × 10) - (0,3 × 10 × 10) = (10 + 10 + 10)a
45 = 30a
a = 1,5 m/s²
Opsi : B