Step 1 :\(a(t) = t^2 - 5t + 3\)
Step 2 :\(v(t) = \int a(t) dt = \frac{1}{3}t^3 - \frac{5}{2}t^2 + 3t + C_1\)
Step 3 :\(v(0) = 0 = \frac{1}{3}(0)^3 - \frac{5}{2}(0)^2 + 3(0) + C_1 \Rightarrow C_1 = 0\)
Step 4 :\(v(t) = \frac{1}{3}t^3 - \frac{5}{2}t^2 + 3t\)
Step 5 :\(s(t) = \int v(t) dt = \frac{1}{12}t^4 - \frac{5}{6}t^3 + \frac{3}{2}t^2 + C_2\)
Step 6 :\(s(0) = 0 = \frac{1}{12}(0)^4 - \frac{5}{6}(0)^3 + \frac{3}{2}(0)^2 + C_2 \Rightarrow C_2 = 0\)
Step 7 :\(s(1) = 20 = \frac{1}{12}(1)^4 - \frac{5}{6}(1)^3 + \frac{3}{2}(1)^2\)
Step 8 :\(20 = \frac{1}{12} - \frac{5}{6} + \frac{3}{2}\)
Step 9 :\(\frac{1}{12} - \frac{5}{6} + \frac{3}{2} = \frac{1 - 10 + 9}{6} = \frac{0}{6} = 0\)
Step 10 :\(C_2 = 20\)
Step 11 :\(s(t) = \frac{1}{12}t^4 - \frac{5}{6}t^3 + \frac{3}{2}t^2 + 20\)
Step 12 :\(\boxed{s(t) = \frac{1}{12}t^4 - \frac{5}{6}t^3 + \frac{3}{2}t^2 + 20}\)