Question

An object at rest starts moving and attains a velocity of $10m{s}^{-1}$ after 5 s. What is the acceleration?

• A. $1m{s}^{-2}$
• B. $2m{s}^{-2}$
• C. $3m{s}^{-2}$
• D. $4m{s}^{-2}$

Answer 1

The correct option is B

$2m{s}^{-2}$

Given, initial velocity $u=0m{s}^{-1}$, final velocity $v=10m{s}^{-1}$ and time $t=5s$.

Let acceleration be $a$.

As we know, $a=\frac{v-u}{t}$.

So, $a=\frac{10-0}{5}=2m{s}^{-2}$.

Therefore, acceleration of the body is $2m{s}^{-2}$.