If the mass of the earth decreased by a factor of 2 with no change in radius, your weight would:

a. increase by a factor of 4.

b. increase by a factor of 2.

c. stay the same.

d. decrease by a factor of 2.

e. decrease by a factor of 4.

The correct  answer will be option ''d''.

Explanation:

If the mass is bigger, the attraction power (gravity) will be bigger. If actual mass of the earth give us a gravity of 9.8 m/s2, with a decrease of 2 times earth's mass our gravity will be lower, meaning that our weight will decrease by a factor of 2.

the answer will be b