Differentiate the function f (@ ) = - 3 f' (x) = Differentiate the function f(u) - f (2) The velocity of an object at any point is equal to the rate of change of its displacement at that point. Suppose that an object travels in a straight line and its displacement s mm at time t's is given by s - 6+ + 5+2 + 4. What is the velocity of the object when t - 8? Give your answer in mm s' to the nearest integer The velocity is mm s The height h m of a projectile after t's is given by the equation h - 400t - 5.0t +6 Use differentiation to calculate the maximum height reached by the projectile. Give your answer in m to 3 significant figures. Maximum height: m