A particle moves so that its velocity v (in m/s) varies with time t (in s) over the first 25s as follows:
- from t=0 to t=5s: v rises uniformly from 0 to 10m/s
- from t=5s to t=10s: v stays constant at 10m/s
- from t=10s to t=15s: v rises uniformly from 10 to 20m/s
- from t=15s to t=20s: v falls uniformly from 20m/s to 0
- from t=20s to t=25s: v falls uniformly from 0 to −20m/s
The ratio of distance to displacement in 25s of motion is: