Question

A car moving with speed $2m/s$ crosses an electric post and starts accelerating at a constant rate of $2m/s^2$. What will be the speed of the car after $3s$?

• A. $8m/s$
• B. $9m/s$
• C. $12m/s$
• D. $15m/s$
• E. $18m/s$

Answer 1

The correct option is A $8m/s$

Given : initial speed $u=2m/s$

acceleration $a=2m/s^2$

Calculate speed after time $t=3s$

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

$\therefore$ $v=2+2\times 3=8m/s$