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a(t) = 2 - 4t
v(t) = ∫ a dt
= ∫ (2 - 4t) dt
= 2t - 2t² + C
Pada saat t = 1 s
v(t) = 2t - 2t² + C
v(1) = 2· (1) - 2· (1)² + C
4 = 2 - 2 + C
C = 4 m/s
Persamaan kecepatan
v(t) = 2t - 2t² + 4
untuk t = 3 s
v(t) = 2t - 2t² + 4
v(3) = 2 · (3) - 2 ·(3)² + 4
= 6 - 18 + 4
= 8 m/s ← jawaban