00:01
So here in this question we have to find out the value of the change in the potential energy.
00:07
So the change in the potential energy of a mass of the man is given that is equals to 94 .5 kilogram when he takes the elevator from the first floor to the 38th floor and the distance between the floor is 4 .11 meter.
00:31
So from here what we can say that what basically it's a potential energy is the energy in the body due to its height or due to its position.
00:38
So p is equals to mgh.
00:40
So here we are having the value of g is acceleration due to gravity that is 9 .8 meter per second square.
00:47
H is the height above the reference point.
00:50
So but basically the change in potential energy change in potential energy is the difference between the potential energy at the starting point and the potential energy at the ending point that is delta of p is equals to pe final minus pe initial.
01:09
So here as we calculate the final and initial velocity since we know that the distance between the floor d is given that is equals to 4 .11 meter and we can say that the number of floors between 1 and 38 is 37 floors.
01:34
So the total height from here is equals to 4 .11.
01:40
This is height per floor multiplied by the 37...