This is easy
Number 2 is 20 N to the right
Number 3 is 30 N up
Both are unbalanced
Can you show exactly what do you want ?
Point a because point a is the highest at potential energy converting into the highest kinetic energy.
Explanation:
In the trachea's inner layer, you have small, hair-like structures called cilia. Cilia move in rhythm to push mucus out of your trachea so that you either expel or swallow it
Answer:

Explanation:
Using the gravitational force equation

D is the distance from the center of the earth 
Now, we can equal this equation to the centripetal force.

V is the speed of the satellite





But if we evaluate the force at the surface of the earth we have:




Then we can use this expression into the equation of V

I hope it helps you!