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400=1/2xmx4^2
400=1/2xmx16
400=8m
400/8=m
50=m
Ek = 400 J
V = 4 m/s
Dit:
Massa ?
Jawab:
Ek = 1/2 x m x v²
400 = 1/2 x m x 4 x 4
400 = 1/2 x m x 16
400 = 8 x m
m = 400 : 8
m = 50 kg
Jadi, m adalah 50 kg
~~Fisika Class 7
Note:
Ek = Energi Kinetik (J)
m = massa (kg)
v = kecepatan (m/s)