The mass and radius of the Earth are 5.98x1024kg and 6.38x10 m, respectively. a) Neglecting air resistance, with what velocity does a 1000 kg object strike the surface of the earth if it is released from a height of twice the radius of the Earth above the Earth's surface? b) How many times faster is the velocity of another object with a mass of 2000kg if it is released from the same altitude? Justify your