Question

With what speed should a body be thrown upwards so that the distances traversed in $5^{th}$ second and $6^{th}$ second are equal?

• A. $5.84m/s$
• B. $49m/s$
• C. $\sqrt{98}m/s$
• D. $98m/s$

Answer 1

The correct option is B $49m/s$

Let the upward direction be taken positive.
For the distance covered in $5^{th}$ second and $6^{th}$ second to be equal, the body must start descending after $5^{th}$ second.
$\Rightarrow$ Total time taken in upward journey should be $5s$
$\therefore u=gt=9.8\times 5=49m/s$