00:01
So for part a, we can say the kinetic energy initial plus the potential energy initial will equal the kinetic energy final plus the potential energy final.
00:11
Again, we know that this would be 1 .5mv initial squared plus mgh initial.
00:18
And this is going to be equaling 1 .5mv final squared plus mgh, mgh final.
00:27
Another way of saying this, we can simply say mg, h initial minus h final, will be equaling one half times mass multiplied by v final squared minus the initial squared.
00:45
And here we know that the initial velocity is going to be zero, so we can eliminate that term.
00:50
And we can then eliminate the mass on both sides.
00:54
And we find that then the velocity final is going to be equalling the square root of 2gh initial minus h final.
01:07
This would be equalling the square root of 2 multiplied by 9 .80 meters per second squared, multiplied by 5 meters minus 3 .20 meters.
01:19
And we find that velocity final, or we can say better yet, the velocity at point b is equaling 5 .94 meters per second...