1. The problem statement, all variables and given/known data 2 meteoroids are 160,000 km from Earth's center and heading straight toward Earth. One is moving at 10 km/s, the other at 20 km/s. At what speeds will they strike Earth? 2. Relevant equations K + U = K_i + U_i U = -GMm/R 3. The attempt at a solution Ok, either i'm having a serious brain fart. But are those the right equations i'm concentrating on?