A particle moves according to a law of motion s = f(t), t ≥ 0, where t is seconds and s feet. f(t) = t^3 − 9t^2 + 24t Find velocity at t.When is particle at rest?

Answer 1

I don't know why they're not teaching this is calculus anymore, but velocity (which is the rate of change of position over time) is just the derivative of position.