Question

Write the equation of motion to find time to reach ground for a body dropped from a certain height.

Answer 1

$\bold\red{\underline{\underline{Answer:}}}$

$\bold{s=\frac{1}{2}×at^{2}}$

$\bold\purple{Explanation}$

$\bold{If \ body \ is \ in \ motion \ of \ falling}$

$\bold{ it's \ initial \ velocity \ will \ be \ zero}$

$\bold\green{\underline{\underline{Solution}}}$

${\bold{Let \ certain \ height \ be \ s}}$

$\bold{It's \ acceleration \ will \ be \ a}$

$\bold{According \ to \ Newton's \ second}$

$\bold{equation \ of \ motion}$

$\bold{s=ut+\frac{1}{2}×at^{2}}$

$\bold{But \ u=0}$

Therefore,

$\bold\purple{Required \ equation \ of \ motion \ is}$

$\bold\purple{ s=\frac{1}{2}×at^{2}.}$