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Verified answer
A = (Vt - Vo) / ▲t2 = (Vt - 20) / 14
28 = Vt - 20
Vt = 48 m/s
Note:
a = percepatan (m/s^2)
Vt = kecepatan akhir (m/s)
Vo = kecepatan awal (m/s)
▲t = selang waktu