Calculate the speed of an artificial satellite of Mars, revolving around it in a circular orbit at an altitude of 100 km above the surface.

In a circular orbit, the speed is equal to the first cosmic V1 = (GM / R) ^ 1/2. For the conditions of the problem we get V = (6.67 * 10 ^ -11 * 6.4 * 10 ^ 23 / 3.5 * 10 ^ 6) ^ 1/2, V = (12.2 * 10 ^ 6) ^ 1/2 = 3.5 * 10 ^ 3m /s = 3.5km / s.

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