Can't really plot a graph here for question 1.
2a) The car speeds up from A to B. The car travels at a constant speed from B to C. The car slows down to a stop from C to D.
b) From the graph, at 10 seconds, the car is moving at 20 m/s.
The 4 significant figures of 31,546,000 are all 8 of the digits.
It would be "Researchers found environmental safe replacements for CFC's"
