Determine the orbital speed of a satellite that skims just above the surface of Mars

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Determine the orbital speed of a satellite that skims just above the surface of Mars. Take Mars’ mass

M_M = 6.42\times10^{23}\,\text{kg}

, radius

R_M = 3.39\times10^{6}\,\text{m}

and

G = 6.67\times10^{-11}\,\text{N m}^2\text{kg}^{-2}