Question

a boy standing at top of tower 20 m height dorps a stone assuming g= 10 ms the velocity with which it hits the ground is​

Answer 1

$\huge\fcolorbox{red}{y}{Question}$

A boy standing at top of tower 20 m height dorps a stone assuming g= 10 ms the velocity with which it hits the ground is ______.

To Find:-

• Find the velocity when the ball hits the ground.

$\huge\fcolorbox{red}{yew}{Formulas}$

• v = u + at
• v² - u² = 2as
• s = ut + 1/2 at²

$\huge\fcolorbox{red}{ye}{Solution}$

When there is a free fall, we can directly use the equation of motion:

v² - u² = 2as

here v = 0

so,

v = √2gh = √ 2 × 10 × 20 = 20m/s