Free fall

For how long and at what speed does the body fall to the ground during a free fall from a height of 35 m?

Correct answer:

t =  2.6712 s
v =  26.205 m/s

Step-by-step explanation:

$$\begin{gathered} s=35\text{ m } \\ a=9.81{\text{m/s}}^2 \\ s={\displaystyle \frac{1}{2}}a{t}^2 \\ t=\sqrt{2\cdot s\mathrm{/}a}=\sqrt{2\cdot 35\mathrm{/}9.81}=2.6712\text{ s} \end{gathered}$$

$v=a\cdot t=9.81\cdot 2.6712=26.205\text{ m/s}$

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