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= ½×m×v²
=½×400×5²
=200×25
=5000 J
maaf kalau salah
v:5m/s
Dit:Ek
jawaban:Ek:1/2.m.v2
:1/2.(0,4kg).(5m/s)2
:1/2.(0,4).(25m/s)
:5 Joule