A NASA satellite has just observed an asteroid that is on a collision course with the Earth. The asteroid has an estimated mass, based on its size, of 5.05×109 kg. It is approaching the Earth on a head-on course with a velocity of 619 m/s relative to the Earth and is now 5.15×106 km away. With what speed will it hit the Earth's surface, neglecting friction with the atmosphere? I tried Ep + Ek = Ek + Ep, but no luck, is there a problem with my formula? Ep = GMm/r r being the distance between the com of the two.