A particle's position is s(t)=t3−6t2+9ts(t) = t^3 - 6t^2 + 9ts(t)=t3−6t2+9t. When is the particle at rest?
t=1,t=3t=1, t=3t=1,t=3
t=0,t=2t=0, t=2t=0,t=2
t=2,t=4t=2, t=4t=2,t=4
t=1,t=2t=1, t=2t=1,t=2