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Ek = 1/2 m v²
m adalah massa (dalam kg)
v adalah kecepatan (dalam m/s)
1) Ek = 1/2 m v²
v² = 2Ek/m
v = √(2Ek/m )
= √(2x2000/0.025)
= 160 000 m/s
2) Ek = 1/2 m v²
m = 2Ek/v²
m = 2(100)/2²
m = 50 kg