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Verified answer
R(t) = (3t^2 - 2t)i +(-t^3) jv(t) = r'(t) = (6t - 2t)i +(-3t^2) j
v(2) = (12 -4)i + (-3(4))j
V(2) = 8i -12j
|V|= √(8² +(-12)²) = 4√13 m/s
tan α = 8/-12 = - 4/3 -> α = tan⁻¹ (-4/3) = 126,9°