given that
initial velocity of car = 0 m/s
after t = 10 s
final velocity of the car = 25 m/s
now for average acceleration we can use
[tex]a = \frac{v_f - v_i}{/Delta t}[/tex]
[tex]a = \frac{25 - 0}{10}[/tex]
[tex]a = \frac{25}{10} = 2.5 m/s^2[/tex]
so here the acceleration will be 2.5 m/s^2