A spacecraft is coasting toward Mars. The mass of Mars is 6.00×10^(23)kg, and its radius is 3.40×10^6m. When the spacecraft is 7.08×10^6m from the center of Mars, the spaceraft's speed is 2930m/s. Later, when the spacecraft is 3.96×10^6m from the center of Mars, what is its speed?
