Answer:
The answer to this is D two of the above
The earth is considered an Open system which is B.
Answer:
35/2 J/s
Explanation:
Just use the 2 formulas
Work done = Force * distance moved
Power = Work done/time
WD = 7 * 50 = 350
Power = 350 / 20
= 35/2 J/s
There is no acceleration when an object has balanced forces on it. It either moves at a constant velocity or doesn't move at all
