Question

a man weights 600N on the surface of earth. what would be his mass and weight on surface of moon

Answer 1

Hi friend ....

Newton (N) is the Unit of force. And 1 N is the force needed to accelerate 1 kilogram of mass at the rate of 1 meter/second..
In earth; 1 kg mass produce 9.81 N force in direction to the center of gravity of earth. In an other words, if mass produce 9.81 N force in earth that mass is must be 1 kg. 
In your question; 600 N force is always 600N force.

You mean, when you measure the force of mass is 600 N on earth, same mass is produce 600x(1.62/9.81) = 99.08 N on Moon, and 600x(3.71/9,81)= 226.91 N on Mars.
hope it helps u .....

Answer 2

mass of man =m
gravitational acceleration (g) =9.8m/sec^2
weight is the force exerted by the body on Earth.So,
m×g=600N
m×9.8=600
m=600/9.8
m=61.224=61kg approx
as mass of any object remains constant all over the universe.So,
the mass of object on the moon is 61kg

Now weight of any object on Moon is 1/6 of the weight of the object on earth.So,
weight on earth×1/6 =Wight on Moon
600×1/6=100N

I hope that my answer would help you and if it does kindly mark it as the brainleast answer