Answer:
The value of x is 
The value of the velocity at the top is 
Explanation:
The diagram of this process is on the first uploaded image
From the question we are told that
The mass of the block is 
The distance of compression is 
The force constant is 
The radius of the circular track is 
The speed at the bottom of the track is 
The frictional force experienced is 
Now looking at this process we see that the potential energy of the spring is been transformed into the kinetic energy of the block . So,

mathematically i.e


Making x the subject of the formula


The average workdone by friction is 
Here 


The kinetic energy at the bottom is


The potential energy gained at the top of the circle is

Here h is the height which is equal to d(diameter) = 2r = 2 × 1 = 2 m and
g is acceleration due to gravity 
Now substituting values


Since energy is can not be created nor destroyed but transformed according to first law of thermodynamics

![43.99 = 9.604 +21.99 + [\frac{1}{2} m_b * v_{top} ^2]](https://tex.z-dn.net/?f=43.99%20%3D%209.604%20%2B21.99%20%2B%20%5B%5Cfrac%7B1%7D%7B2%7D%20m_b%20%2A%20v_%7Btop%7D%20%5E2%5D)
![12.369= [2.45* v_{top} ^2]](https://tex.z-dn.net/?f=12.369%3D%20%5B2.45%2A%20v_%7Btop%7D%20%5E2%5D)

