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N-mg=0
N=mg=40*10=400N
b. lift bergerak naik dengan percepatan 2 m/s²
N-mg=ma
N=ma+mg= 40(10+2)=480N
c. lift bergerak turun dengan percepatan 2 m/s²
mg-N=ma
N= mg-ma=40(10-2)=320 N