Oh I see, but how do you get v after finding the change in PE?
And from there how do I apply it to the interval which frictino decreases the speed?
I may be understanding something wrong.
Thanks again for the reply
Homework Statement
Evil Alien has put an Asteroid with
mass of 1,000,000kg to destroy mankind.
Distance from center of the Earth to Asteroid
(assume negligible center) is
10^8m and let's the gravitational force do the work.
Earth radius is 6.4 x 10^6m
and its mass is 5.98 x 10^24kg...