Robert leaves the starting line of a 100m sprint at 10m/s. By the end of the race,

[whycantigetagoodnickname]

Its a while but if I am right,

Acceleration = (End Speed - Starting Speed) / Time

So A = (20 - 10) / 15
or
A = 10/15 or 2/3 or 0.6667

 

[whycantigetagoodnickname]

Its a while but if I am right,

Acceleration = (End Speed - Starting Speed) / Time

So A = (20 - 10) / 15
or
A = 10/15 or 2/3 or 0.6667

 

[Intimate_Vision]

he is running 20m/s.-? His total time was 15 secounds. What was his acceleration?
Please help me!