00:01
Hello everyone, in given condition he says that that is a ball and that ball consider a mass that is a 5 kilogram.
00:09
Is fall through the and from the height of a 20 meter, okay? when that body is dropped from any height, when initially is considered a zero, after traveling a 20 meter height in a downward direction, the velocity of that body becomes a at that position this is the 10 meter per second.
00:35
Find the work done by the air resistance.
00:38
Means initially there is some air resistance will be considered in an upward direction, guys.
00:44
So 8, this is the position number 1 and this is the position number 2.
00:50
In a whole diagram guys, you can see the downward force will be applied in an g and the resistance for we are assumed in an upward direction.
01:00
How we can calculate a work done? so work done can be converted into a change in a kinetic energy.
01:07
Initially, if you are considered at the position 1, the kinetic energy is equivalent to 0, june.
01:15
You can see that the body will be achieved the velocity at the position 2, that is a 10 meter per second...