Question

A stone is thrown vertically upwards with an initial velocity of $30\text{m/s}$. The time taken for the stone to rise to its maximum height is
[Take $g=10{\text{m/s}}^2$]

• A. $4\text{sec}$
• B. $2\text{sec}$
• C. $3\text{sec}$
• D. $6\text{sec}$

Answer 1

The correct option is C $3\text{sec}$

As we know that, at maximum height, velocity of the stone will be zero i.e. $v=0$
Give, initial velocity of stone $u=30\text{m/s}$
Time taken by stone to rise to its maximum height is $T=\frac{u}{g}=\frac{30}{10}=3\text{sec}$