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800 N = Wa
Wa = m.g
800 N = m . 10 m/s²
m = 800 N / 10 m/s²
m = 80 kg
Rumus berat = W = m.g karena percepatan gravitasi bertambah jadi rumusnya : W = m(g+a)
Wb = m(g+a)
Wb = 80 kg ( 10 m/s² + 5 m/s²)
Wb = 80 kg . 15 m/s²
Wb = 1200 N
Jadi berat benda di dalam lift adalah 400 N
Ket: Wa = berat di lantai
Wb = berat di dlm lift
W = berat
m = massa benda
a = percepatan
g = gravitasi
Nb : Maaf kalau ada kesalahan.