This was on my test and I took a guess because I was so confused. The question is that an asteroid hits earth and now the Earth has a mass of 1.5 times its original mass and a radius of .75 times its original radius. What is its new force of gravity? its driving me crazy because it seemed like it should be one of the easiest problems on the test but i was stumped for some reason. how should I have done this? Thanks!!!!