00:01
Hello students, let us look on this question.
00:02
So, in this question a body is projected vertically upward with speed of u that we have given here and the drag force d on the body is minus of m k v.
00:14
If body is moving upward then the opposite drag force is present in the atmosphere.
00:19
Find the time to reach the body to maximum height.
00:22
We have to find when it will have its maximum height.
00:26
We can say maximum height be equal to 0.
00:28
Yeah, definitely.
00:29
So, if i am applying the f net is equal to m a newton's second law.
00:34
So, i know a is equal to f net by m and if body is moving upward then gravitational pull and the drag pull both will push downward and both are in same direction.
00:49
So, i can write it as f force of gravitational plus force of drag both will oppose this motion divided by m.
00:57
So, i can write it also like this minus of m g plus m k v that we have given in the question divided by m because this is minus because of these two forces because body is moving upward...