A problem says :
A car starts from rest and undergoes a constant acceleration. It travels 5 m in the t interval 0 s to 1 s, find the displacement of the car during the time interval from 1 s to 2 s?
the answer is 15m and I wonder why it is!
Because the acceleration in the interval from 0 to 1 will be 5 m/s^2 ..and from 1 to 2 will be 10 m/s^2
Therefore the displacement will be 10m not 15. What do you think?