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Vt = Vo + at
22 m/s = Vo + ( 2 m/s² x 4 s)
22 m/s = Vo + 8 m/s
Vo = 22 m/s - 8 m/s
Vo = 14 m/s
Jadi kecepatan awalnya adalah 14 m/s
"Maaf apabila ada yang salah"