Question

A car acceleration from rest to a speed of 100m/sec in 25sec. Calculat its acceleration

Answer 1

acceleration
$= \frac{v - u}{t}$
$= \frac{100 - 0}{25} \\ = \frac{100}{25} \\ = 4$
Acceleration is 4m/s^2

Answer 2

v=100m/s
t=25s
u=0m/s
so from
v=u+at
100=0+25a
or, a=4m/s