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2Ek = mv^2
massa sama jdi di abaikan
10.000 = (vt - v0)^2
100 = vt - v0
jika, vt = 1/2v0
100 = vt - 2 vt
vt = - 100 m/s
v0 = -200 m/s
Ek = 1/2 v^2 = 1/2 (-100+200)^2 = 1/2 (-100)^2 = 5000joule