1. What is the acceleration due to gravity on the surface of Mars? Mars has a mass of 6.4 x 10 kg and a radius of 3.4 x 10 m. 2. Calculate the escape velocity of Mercury. Mercury has a mass of 3.3 x 10 kg and a radius of 2.4x 10' m. 3. Calculate the escape velocity of the Sun from the Earth. The Sun has a mass of 2.0 x 1030 kg and the Earth is 1.5 x 10 m away from the Sun