Question

A body starts from rest and moving with an acceleration $2{\text{ms}}^{–2}$. The velocity of the body when it covers a distance of $10\text{m}$ (in ${\text{ms}}^{–1}$) is

• A. $\sqrt{98}$
• B. $\sqrt{40}$
• C. $\sqrt{20}$
• D. $\sqrt{12}$

Answer 1

The correct option is B $\sqrt{40}$

As we know that
$v^2-u^2=2as$
Here, $u=0,v=?,a=2{\text{ms}}^{-2},s=10\text{m}$
$\therefore v^2-0=2\times 2\times 10$
$v^2=40$
$v=\sqrt{40}{\text{ms}}^{–1}$