Question 9 (2 points) What function measures the rate of change of distance? Question 10 (2 points) A ball is thrown downward from the top of a 20 m tall building with an initial velocity of 15 m/s. What equation could be used to model its height, h(t)? Question 6 (2 points) An object has a position (in metres) given by the expression s(t) = t] - 4t2 + 5, where t is measured in seconds. What is the velocity function? Question 7 (2 points) A projectile is launched with a velocity of 30 m/s at 40" to the ground. To two decimal places, what is its horizontal velocity in m/s? Question 8 (2 points) If the velocity function vit) of an object is at its maximum, then the value of a(t), its acceleration, is