00:02
Hello, so for the free body diagram, let's assume this is the floor of the elevator.
00:11
Okay, so you're standing here, right? so your weight is of course, we go down, that's going to be ng, and then there's going to be a normal force in the opposite direction.
00:35
Of course, acceleration is going up.
00:38
What was given by the question.
00:41
So that's going to be the free body diagram.
00:44
We can figure out the mass.
00:47
So the mass is going to be just the weight over g.
00:52
That's going to be 625 over 9 .8, acceleration due to gravity.
01:01
Mass is going to be 63 .78.
01:07
So now let's look at the first part of the question.
01:13
So if you look at this, because the acceleration, so we're going to be using newton second law f equals m a so because acceleration is up it means that the uh the normal forces bigger on the weight so it's going to be f n minus g equals n so f n is going to be n g plus m a or you can say m into bracket g plus a okay so this is just going to be 63 .78 into bracket 9 .8 plus 2 .5.
01:58
We're given 2 .5 in the question.
02:00
So that's the acceleration.
02:03
So the normal force is going to be 784 .4 .4 nims...