2,450 Joules, kinetic energy is 1/2 mass x velocity squared.
Answer:As the temperature increases, the helium in the ballon expands.
Explanation:
I took the quiz already
By definition, we have that the work done is given by:

Where,
F: force in the direction of displacement
d: displaced distance
Substituting values we have:

Then, the power is given by:

Where,
t: time
Substituting values we have:


Answer:
The work done on the box is 100 Nm, and the power is 20 Nm/s.
The Sun <span>produces energy by forming "Helium" in its core by the process of "Nuclear fusion"
Hope this helps!</span>