The answer will be 50N.
This is because the spring reads weight and weight is mass times acceleration due to gravity.5kg*10m/s2=50N
We can find the average speed of the body by finding the total distance covered, and then dividing it by the total time of the motion.
The total distance covered is:

while the total time of the motion is

So, the average speed of the body is:
I think its D answer
sorry I dont have explanation but I think its D
Answer:
Force, F = 16814.95 N
Explanation:
It is given that,
Mass of space station, m = 2010 kg
Altitude, 
Mass of earth, 
Mean radius of earth, 
Magnitude of force is given by :

R = r + d


F = 16814.95 N
So, the force between the space station and the Earth is 16814.95 N. Hence, this is the required solution.