First slide

Rectilinear Motion

Question

A body is dropped freely from the top of a tower of height of 39.2 m. The time of descent is………..

Easy

A

$\sqrt{6} s$
B

$8 s$
C

$2 s$
D

$\sqrt{8} s$

Solution

For a freely falling body
Time of descent $t = \frac{\sqrt{2 h}}{g}$
$\begin{array}{l} = \sqrt{\frac{2 \times 39.2}{9.8}} \\ = \sqrt{8} s \end{array}$

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