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30000 = 1/2 x m x 20 m/s x 20 m/s
30000 = 1/2 x m x 400
30000 = 200 x m
m = 30000 : 200
m = 150 kg
Jadi, massa mobil tersebut adalah 150 kg
Note:
Ek = Energi Kinetik (Joule)
m = Massa (kg)
v = kecepatan (m/s)
v²
= 2×30.000
20²
= 60.000
400
= 150 kg