Hi, i am having trouble with solving this problem and need help. Thank you.  A particle moves according to a law of motion s = f(t), t ≥ 0, where t is measured in seconds and s in feet.  f(t)=t^3 - 9t^2 +24t  . How would you find the acceleration (in ft/s^2) at time t ? a(t)= ? ft/s^2 and How would you find the acceleration (in ft/s^2) after 1 second ? a(1)= ? ft/s^2