Answer:

Explanation:
The inital electrostatic force between the two spheres is given by:

where
is the initial force
k is the Coulomb's constant
q1 and q2 are the charges on the two spheres
r is the distance between the two spheres
The problem tells us that the two spheres are moved from a distance of r=20 cm to a distance of r'=10 cm. So we have

Therefore, the new electrostatic force will be

So the force has increased by a factor 4. By using
, we find

Answer: D) dedicate as many hours as needed to the work.
Explanation:
edge 2020
Answer:
The value of acceleration of a stone in free fall is
.
Explanation:
Given that,
Mass of the object, m = 0.9 kg
Weight of the object, W = 9 N
We need to find the acceleration of a stone in free fall. The weight of an object is given by :
W = mg
g is the acceleration of the stone in free fall
So, 


So, the value of acceleration of a stone in free fall is
. Hence, this is the required solution.
The answer is B community based sports program