Question

a car starts from rest attains speed 20m/sin 25second what is its acceleration

Answer 1

$u = 0 \\ v =2 0 \frac{m}{s} \\ a = \\ a = \frac{v - u}{t} \\ = \frac{20 - 0}{25} \\ \\ \frac{20}{25} \\ = 0.8$
is meter per second square

Answer 2

Acceleration of car is 0.8 m per sec sq.