Answer:

Explanation:
As we know that work done by electric force is given as

so here we know that charge is moving from

to another position
so we will have




Answer:
Without this slack, a locomotive might simply sit still and spin its wheels. The loose coupling enables a longer time for the entire train to gain momentum, requiring less force of the locomotive wheels against the track. In this way, the overall required impulse is broken into a series of smaller impulses. (This loose coupling can be very important for braking as well).
Explanation:
Answer:
C. An ion with a +2 charge
Explanation:
I guess