Question

A body moves with initial velocity $10m{s}^{-1}$. If it covers a distance of $20m$ in $2s$, then acceleration of the body is

• A. Zero
• B. $10m{s}^{-2}$
• C. $5m{s}^{-2}$
• D. $2m{s}^{-2}$

Answer 1

The correct option is A Zero

Suppose the acceleration is $a$ then using the second equation of motion, $s=ut+\frac{1}{2}a{t}^2$

and putting $t=2sec$ and $u=10m/s$

we get $20=10\times 2+a\times 2$

or $a=0$ that is $uniform$ motion.