If a body moves in a straight line according to the law s = 24t + 3t2 – t3 , where s is the distance measured in meters from the origin and t is the time in seconds after it starts to move, calculate

If a body moves in a straight line according to the law s = 24t + 3t2 – t3 , where s is the distance measured in meters from the origin and t is the time in seconds after it starts to move, calculate the body’s velocity as a function of time.