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Δt = 10 s
v2 = 20 m/s
a = Δv ÷ Δt
1, 2 m/s² = ( 20 + x ) ÷ 10
1, 2 × 10 = 20 + x
12 = 20 + x
x = 12 - 20
x = -8
Jadi kec. awl mobil adalah -8 ( diperlambat ) m/s