The motion of a vehicle is shown in the following position- time graph D) determine the overall distance travelled by the vehicle.

70 60 50 Position (m) 40 30 20 10 0 10 20 30 40 Time (s) a) During which time interval is the object: i. travelling backward? 1 mark ii. stationary? 1 mark b) Determine the velocity for the following time intervals: 0-10 s: 1 mark 18-30 s: 1 mark c) Calculate the average velocity from 10-30 s: c) 2 marks