A particle moves along s(t)=t3−6t2+9ts(t) = t^3 - 6t^2 + 9ts(t)=t3−6t2+9t. When is the particle at rest?
t=1,3t = 1, 3t=1,3
t=0,2t = 0, 2t=0,2
t=3t = 3t=3
t=1t = 1t=1