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jadi karena massa 1kg
saat t=3 maka v=30.3+3.3=90+9=99m/s
I = ∫ F dt
m v = ∫ F dt
1 · v = ∫ (30 + 2t) dt
v = 30t + t²
untuk t = 3 s
v = 30 · 3 + 3²
= 90 + 9 = 99 m/s ← jwb