m=G/g=16N/(10N/kg)=1.6kg.
高空时的重力加速度为g1,则
F-mg1=ma
g1=(F-ma)/m=5/8(m/s＾2)
g=GMm/R＾2 (1)
g1=GMm/(R+h)＾2 (2)
g/g1=(R+h)＾2/R＾2
则h/R=(g/g1-1)＾1/2=3