Mars gravitional force problem? (check my answer)?

Question

Mars gravitional force problem?

Mars has a mass of 6.422x10^23kg anda r adius of 2111 miles, How much does a 1.0 kg object weigh on the surface of Mars (in Newtons)?

I believe the answer is 3.713

Answer 1

F=G*m1*m2/r^2

G=6.6724*10^(-11) N m^2/kg^2

m1=6.422*19^23
m2=1kg
r=2111 miles *1609 m/mile=3.4 x 10^6

Plugging in we get

F=3.714 N -- Close enough

Answer 2

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Answer 3

Mars has roughly 40% of the gravity of Earth.

Should match up.