Gravitational fields

Question 1

Where on the earth is best to launch a satellite into orbit and why? [2]

Answer 1

The equator
The satellite will have the greatest kinetic energy due to the rotation of the earth so least amount of fuel required to launch it into orbit

Question 2

Between two satellites in circular orbit around earth where one is higher. How do their linear speeds compare? [2]

Answer 2

The satellite in higher circular orbit will have a smaller linear speed.
v = √GM/r
or
v inversely proportional to the root of the radius of orbit