Abicycle rider increases his speed from 5 m/s to 15 m/s in 10 seconds

To find the acceleration of the bicycle rider, we are going to use the acceleration formula: 
where
is the acceleration 
is the initial speed 
is the final speed 
is the time 

We know from our problem that increases his speed from 5 m/s to 15 m/s in 10 seconds, so his initial speed is 5 m/s and his final speed is 15 m/s; therefore, , , and. Lets replace those values in our formula:





We can conclude that the acceleration of the bicycle rider 1 m/s^2

Yes the slope to this is -5