What average force is needed to accelerate a 7.00-gram pellet from rest to 125 m/s over a distance of 0.800m along the barrel of a rifle?

i believe the answer is b.

the device is called “ rocket engine”

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.