P=w/t
w=15
t=3
therefore, 5 watts (b)
It is B since they are traveling at the same speed one is positive so the other had to be negative hope this helps;)))))
Answer:
The new force becomes 4 times the initial force.
Explanation:
The force of attraction or repulsion is given by the relation as follows :

Where
d is the distance between the interacting charges
F is inversely proportional to the distance between charges.
If the distance is halved, d'=(d/2), new force is given by :

So, the new force becomes 4 times the initial force.