00:03
So kinetic energy varies jointly as this mass in the square of speed.
00:06
If the mass of 100 ,000 kilograms is traveling at 15 meters per second, and this kinetic energy is 112 ,500 joules, what it would be for the same mass traveling at 18 meters per second.
00:18
So since we know that kinetic energy is varying jointly, that means we can say kinetic energy is e is going to be equal to our k value, which we need to solve for, times its mass, which we'll say is m, times its speed squared.
00:31
So s squared.
00:33
Now we can plug in what we know, which means our energy, kinetic energy is 112 ,500, is going to be equal to k, which we're solving for, times our mass, which is 1 ,000, times our speed, which is 15 meters per second, and we're going to square that.
00:51
Now when we go ahead and multiply our stuff out so we can solve, we still have our 112 ,500 is equal to k times 15 squared is 225, times.
01:02
Times 1 ,000, which is 225 ,000...