• The gravitational pull of the earth is inversely proportional to the square of the distance of the object from the center of the earth. At the Earth's surface, this force is equal to the objects normal weight mg, and at large distances , the force is zero. If a 20 000kg asteroid falls to the earth from a very great distance away, what will it be its maximum speed as it strike the Earth's surface, and how much kinetic energy will impact to our planet.you can ignore the effects of the Earth's atmosphere.