Answer:
D
Explanation:
Let's look at each option:
A. Distance =600 ✓
This is because the graph is a distance- time graph. To find the distance between her house and the post office, look at the y value of the point at the end of her journey. In this case, at t=24 mins, the y -value is 600 and thus the statement is correct.
B. ✓ correct
First 9 mins is from t=0 to t=9. Speed can be found by taking the gradient of the line of a distance- time graph.
Gradient can be found by taking rise/ run, which is also the difference in the y- coordinates divided by the difference in the x -coordinates.
Thus, the speed in the first 9 minutes is indeed 35m/min.
C. ✓correct
Since distance remained at 315m from t=9 to t=13mins, she stopped for that period of time.
Time stopped
= 13 -9
= 4 minutes
D. Incorrect
Average speed= total distance/ total time
Total distance= 600m
Total time= 24 mins
Thus, average speed
= 600 ÷24
= 25m/min