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3.(1)2 + 2.(1) + 3
3 + 2 + 3
8
t5 = 3t2 + 2t + 3
3.(5)2 + 2.(5) + 3
3.(25) + 10 + 3
75 + 13
88
maka 88 - 8 per 5 - 1 = 80/4 = 20 m/s2