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diketahui
m = 50 kg
α = 30°
F = 400 N
μk = 0,7
ditanya: percepatan, a
penyelesaian:
ΣF = ma
F cos 30 - fk = ma ===> fk =μk N
F cos 30 - μk(mg - F sin 30) = ma
400*1/2*√3 - 0,7(50*10 - 400*0,5)=15a
200√3 - 210 = 15a
346,4 - 210 = 15a
136,4 = 15a
a = 9 m/s²