Power = Work / time
The work given here is 83J and the time it took to do 83J of work was 3s
So..
Power = 83J / 3s
Power = 27.67 W or 27.7 W
The electrostatic force between the two charges is

where q1 and q2 are the magnitudes of the two charges, and r the distance between them.
We can see from the formula that F is proportional to the product between the two charges:

so, if the magnitude of each charge is doubled, the new force will get a factor 4:

So, the new force will be 4 times the original force:
If you know the distance and the time I travelled that distance.
You just have to divide the time from the distance to get velocity
V =d
_
t
Answer:
See below
Explanation:
Energy is lost in the form of friction/heat/sound
you cannot get more work out of a machine than you put into it.
180 - (40 * 2) = 100°
So the answer is (D) 100°
Hope this helps! :)