Physics Gravitation Level: Misc Level

5-A satellite of mass 50 kg is orbiting the earth at height of 1000 km (as measured above the surface of the earth).The mass of the earth is 5.98x10^24 kg and the earth,s radius is 6.38x10 ^6 m.

A- Find the speed of the satellite in its orbit.

B-If this orbit were decreased, by some external mechanism, by 100 km,would the speed of the satellite increase or decrease?Why?