Combining the circular motion with Newton's Universal Gravitation Law, we have the following formula: v=NGMr, rearrange this formula and calculate the mass of Mars in kilograms rounded to 2 significant figures considering the values for the circular speed and distance of 2.14.103 m/s. a. M=v2•rG;M=6.4×1023 kg b. M=vrG;M=3.0×1020 kg c. M=v2Gr;M=4.1×10-11 kg d. M=v2rG; M=3.6×103 kg

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