Question

Friends pls answer my question:
A body falls freely from a height -h it's average velocity when it reaches earth is?
Options are;
1.√gh 2.√gh/2 3.√2gh 4.g√h

Answer 1

Since the body is falling freely, its initial velocity, u would be 0.

We know that from the third equation of motion, that is

${v}^{2} - {u}^{2} = 2as$
Where v = final velocity or you may say average velocity, a = acceleration and s = displacement.

Here since the body is falling freely, that is in the influence of gravity, its a = g and given that height = h

=> s = h

so we have

v² - u² = 2gh

We know that u = 0

=> v² = 2gh

=> v = √(2gh)
$v = \sqrt{2gh}$
So your answer is option 3


Hope it helps dear friend ☺️✌️