1 A car starts from rest and moves in a straight line with constant acceleration for a distance of 200 m , reaching a speed of \(25 \mathrm {~m} \mathrm {~s} ^ { - 1 }\). The car then travels at this speed for 400 m , before decelerating uniformly to rest over a period of 5 s .
- Find the time for which the car is accelerating.
- Sketch the velocity-time graph for the motion of the car, showing the key points.
- Find the average speed of the car during its motion.