Question

A van starts from rest, accelerates uniformly and attains a speed of $20m/s$ in $25$ seconds. What is the acceleration of the van?

• A. 2 m/s²
• B. 0.8 m/s²
• C. 7.5 m/s²
• D. 4 m/s²

Answer 1

The correct option is B

0.8 m/s²

Here,
Final velocity $v=20m/s$
Initial velocity $u=0$
Time taken $t=25s$
Let, $a$ be the acceleration

Using the equation of motion
$v=u+at$

$20=0+a\times 25$

$\Rightarrow a=\frac{20}{25}$ $m/s^2$

$=0.8m/s^2$