Question

A body has an initial velocity 5 $m{s}^{-1}$. It is accelerating at 2 $m{s}^{-2}$. It's velocity after 10 second is

• A. $20m{s}^{-1}$
• B. $25m{s}^{-1}$
• C. $15m{s}^{-1}$
• D. $10m{s}^{-1}$

Answer 1

The correct option is B

$25m{s}^{-1}$

Given, initial velocity $u=5m{s}^{-1}$, acceleration $a=2m{s}^{-2}$, time $t=10s$ and final velocity $v$

We know that $a=\frac{v-u}{t}$

So, $2=\frac{v-5}{10}$

$20=v-5$

$v=25m{s}^{-1}$