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m = 400kg
a = 2m/s2
g = 9,8m/s2
Ditanya Tegangan tali T jika elevator ketarik ke atas....
T.?
T - w = m.a
T -mg = m.a
T = ma + mg
T = m(a+g)
T = 400(2+9,8)
T = 400(11,8)
T = 4720 N