The earth attracts an apple with a force of 15 Newton. taking this as an action force, how much is reaction force? who accepts the reaction force? on which body does a reaction force act?

15 Newton

Explanation:

According to Newton's third law of motion, "Every action has a reaction which is equal in magnitude but opposite in direction" (Right now, we're not talking about direction, so we'll ignore it)

So,

Action Force = Reaction Force

Reaction Force = 15 N

The action force is by the Earth on the Apple, So the reaction force will be by the Apple on the Earth.

Explanation:

North and South Korea have grown apart as a result of their vastly differing ideologies. North Korea is a communist country with very strict restrictions on the movement of its citizens.  The North Korean regime is well-known for its cruelty. South Korea, on the other hand, is a democratic country with an open-market economy. In a nutshell, both North and South Korea have radically different political and economic systems. They have been two nations for over sixty years. 

South Korea is more advanced than North Korea  

South Korea is economically forward than North Korea  

Has democracy while North Korea has dictatorship