00:01
In this problem, we have been given that there is a planet earth and we are required to determine the height over the earth surface where the acceleration due to gravity, that is 9 meter per second square.
00:18
So let's say the acceleration due to gravity at a height h is g -dash, that's 9 meter per second square.
00:25
And we will know that the acceleration due to gravity on the surface, that is 9 .8 meter per second square.
00:33
And here we have the expression for acceleration due to gravity, and that's gm by r square, where r is the distance of the point where we are computing the acceleration due to gravity with respect to the center of earth.
00:47
So on the surface, its distance from the center, that's the radius of earth.
00:51
So we have 9 .8 equals g times mass of earth over r square.
00:57
Let's mark this as equation 1.
01:00
And at this point p, the acceleration due to gravity that is 9 meter per second square, so that will be gm over r plus h whole square...