00:01
Hello students, here the elevator is moving upward with an acceleration of 12 m per second square.
00:13
Weight of the elevator is acting downward and let's assume the tension in the cable is t.
00:27
So, t equals to, you can write t minus w equals to m into 12.
00:34
W is the weight.
00:35
So, t equals to w plus m into 12.
00:41
This is 2500 into g is 9 .8.
00:46
This is the weight plus mass is 2500 into 12.
00:53
So this is equals to the tension in this cable is 54500 newton.
01:03
Now in the next part we are asked what is the change in kinetic energy of the elevator.
01:10
The final velocity of the elevator after 3 second will be v equals to u plus ft.
01:19
U is 0.
01:20
It started from rest.
01:21
So, this will be 0 plus 12 into 3 meter per second.
01:34
So this is equals to 36 meter per second.
01:38
The change in kinetic energy was to half m v square minus 0 because the initial kinetic energy was 0...