Question

A car increases its speed from $20\text{km/h}$ to $30\text{km/h}$ in $1\text{s}$ then its acceleration is -

• A. $2.78{\text{m/s}}^2$
• B. $5{\text{m/s}}^2$
• C. $7{\text{m/s}}^2$
• D. $3.32{\text{m/s}}^2$

Answer 1

The correct option is A $2.78{\text{m/s}}^2$

We know that, acceleration,

$a=\frac{\Delta v}{\Delta t}$

$\Rightarrow a=\frac{30\times \frac{5}{18}-20\times \frac{5}{18}}{1}=2.78{\text{m/s}}^2$