Cycle question

[Izekid]

The cyclist got a average speed of 1,8m/s and a top speed of 3,6sek
The time is 10 sek.
How do I get to know how long will the cyclist cycle the last 5 sek of the 10 sek. Can i conclude that with my formula?

Please help me

[lightgrav]

If you mean that the top speed is 2 times the average speed, then
(in first approximation of constant acceleration) the lowest speed was zero.
So the graph of velocity vs time is through the origin, straight-line.

How far did he go in the whole 10 seconds? (½ vmax tmax)
this is the area of the triangle "under the curve" v vs t .

How far would he go, in the last half of the race?
(OK, what would his average speed be during this half?)