Answer:
The force (thrust) is equal to the exit mass flow rate times the exit velocity minus the free stream mass flow rate times the free stream velocity.
Answer:
Approximately 8 seconds (which seems to be Answer B although there is a typo)
Explanation:
Use the formula that defines acceleration of an object as the difference between its final velocity and its initial velocity divided by the time it took to go from one to the other:
We use this expression and the values given to solve for the unknown "t" (time):
Given the units of the physical quantities, the answer for t is in seconds. We round it to about 8 seconds.
Freefall is when you don't have any control over your body, you have gravity pulling you down to the center of the earth, while weightlessness you have the ability to float, go down, move side to side. In weightlessness you have zero gravity, but while your freefalling you are in gravity.
Hope I was able to help!