Problem
The two planets closest to Earth are Venus and Mars. Their distances to the Sun are on average:
Sun to Venus: 1.08E8 km
Sun to Earth: 1.50E8 km
Sun to Mars: 2.28E8 km
mass of Sun: 1.99E30 kg
1. What are the orbital velocities of the 3 planets?
2. What change in energy is needed to travel from Earth to Venus?
3. What change in energy is needed to travel from Earth to Mars?