A particle's position is s(t)=t3−6t2s(t) = t^3 - 6t^2s(t)=t3−6t2. Its velocity isA3t2−6t3t^2 - 6t3t2−6tB3t2−12t3t^2 - 12t3t2−12tcheck_circleC3t2+12t3t^2 + 12t3t2+12tDt3−12tt^3 - 12tt3−12tExplanationVelocity = s′(t)=3t2−12ts'(t) = 3t^2 - 12ts′(t)=3t2−12t.