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m = 600 gr = 0,6 kg
kecepatan jatuh
v = - √2gh
= - √(2 · 10 · 80)
= - 40 m/s ke bawah
kecepatan pantul
v' = 2 m/s, ke atas
Impuls
I = Δp
= m v' - mv
= m (v' - v)
= 0,6 · (2 - (-40))
= - 25,2 Ns ← jawaban