(a) Differentiate between speed and velocity. (b) The speed versus time graph for an object is shown below: Speed/ ms ! 6 8 10 time/ s (i) Describe the motion of the object. (ii) Calculate the total distance covered by the object in 10 s. (iii) Calculate the average speed of the object after 10 s. (c) A stone is thrown horizontally off a 25 m high building. It hits the ground a distance of 20 m from the foot of the building. What is the initial velocity of the stone