Jawabanmu

2014-01-28T12:48:34+07:00
Dik : m = 16 Kg
        Resultan gaya = 28 N
        V = 21 m/s

Dit = ΔT = ?

Jawab = a = f/m = 28 / 16 = 1,75 m/s²

A = ΔV/ΔT = 1,75 m/s² = 21 m/s / ΔT

ΔT = 21 / 1,75 = 12 detik