v(t) = [{{(2/10)t, 0<t<=10}, {{4t}/5-6, 10<t<=15}, {(-2/5)t+12, 15<t<=25}}]v(t) = [{{(2/10)t, 0<t<=10}, {{4t}/5-6, 10<t<=15}, {(-2/5)t+12, 15<t<=25}}]

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