v

k = 0.2 (slider from 0 to 0.5, step 0.01)
gL: -1
gR: 6
gU: -4
gO: 35
v(t) = (k * (t^(3) - (7.5 * t^(2)))) + 27.78
v0(t) = If[0 ≤ t ≤ 5, v(t)]
v0a(t) = If[¬(0 ≤ t ≤ 5), v(t)]
b: (v(0) * 1.8)
Text1: "v_{" + k + "}"