00:01
The mass of our fly is 0 .55 grams.
00:04
We want to write that in kilograms when we use it in our equation, so that's going to be 5 .5 times 10 to the negative 4th kilograms.
00:13
We also know from number 19 that the kinetic energy is 75 ,625 joules.
00:23
We want to know what the speed of the fly would be if it had this amount of kinetic energy, so we're going to use our equation for kinetic energy, which is, equal to one half the mass times the speed squared.
00:35
If we want to solve for the speed, we would multiply both sides by two to get rid of that one half.
00:41
And then we would divide both sides by the mass.
00:48
So we get two times the kinetic energy over the mass equals the speed squared.
00:55
And then we want to take the square root of both sides...