The surface gravity of Mars is and its radius is

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

The surface gravity of Mars is

3.7\,\text{m\,s}^{-2}

and its radius is

3.4\times10^{6}\,\text{m}

. What is the minimum speed that a spacecraft must have at launch (neglecting atmosphere) to escape from the Martian surface? (a)

6.3\,\text{km\,s}^{-1}

(b)

3.5\,\text{km\,s}^{-1}

(c)

5.0\,\text{km\,s}^{-1}

(d)

7.9\,\text{km\,s}^{-1}