You gained two pounds while on vacation. which of the following has changed?
a only your mass has changed
b only your weight has changed
c neither your mass nor your weight has changed
d both your mass and your weight has changed

I believe it is d. physical shape n particle amount (amount of particle increase if u gain weight right?), weight directly proportional to mass..

If you are on the airplane during this trip, then ur weight changes, but the mass will stay the same. If you are home by the time the vacation is over, only your mass has changed because the gravitational pull on your body is the same as it was before, while the amount of matter inside of you is different.

Hope this helps