How could I calculate the acceleration due to gravity right above a star (what would I need to know? Or how do I determine the comparable number to Earth's 9.80 m/s?)?

(a) at someones feet

(b) at the top of someones head

(c) the difference in the magnitude in A and B

(d) at someones mass of 73.9 kg, calculate the difference in force in newtons and in pounds

any help would be appreciated!

Thanks