Question

A stone is dropped from a certain height which can reach the ground in $5s$. It stopped after $3s$ of fall and then it is again released. The total time taken by the stone to reach the ground will be

• A. $6s$
• B. $6.5s$
• C. $7s$
• D. $7.5s$

Answer 1

Answer: (C)

$7s$

Using the equation of motions

$h=\frac{1}{2}g\left(25\right)$ $[U=0]$

distance covered $S$ in $3$ seconds

$S=\frac{1}{2}g\left(9\right)$ $\therefore$ distance left $=\frac{1}{2}g\left(16\right)$

$\Rightarrow$ time taken $=4$ seconds

Total time is taken $=7$ seconds