If you are asking for a proof on having at least 3 dimensions in space, you can find the physical proof anywhere in your daily life activities. Just the fact that solids have volumes is a proof already that we live in a three-dimensional space. We can move forwards, backwards, sidewards and in all other directions possible.
When you go right into detail, the fundamental laws governing these proofs are very technical. They have differential equations to show as proof. It is too detailed to discuss here. The important things is that, these fundamental laws are what explains the science in our basic activities and natural phenomena: 
*Gravitation and planetary motion
* Translation, rotation, magnetic field, forces
* Integrals of equations: 
        
             
        
        
        
Answer;
=32.15 meters
Explanation; 
Use the formula  
s= ut+ 0.5 a (t)^2 to find out 's'  
where s= distance traveled  
u=initial velocity which is zero in this case  
t= time taken to travel 's' distance  
a=acceleration (due to gravity on moon i.e 1.62 m/s^2 )  
Therefore;
S = 0.5 * 1.62 * 6.3 * 6.3
     = 32.1489 meters 
Thus; the crater is 32.15 meters deep.
 
        
             
        
        
        
Answer:
Following are the solution to the given question: 
Explanation:
Its best approach to this measurement ought to be to indicate that there was a mistake throughout the calculation, as well as the gathering of further details while researching cells for bacteria, directly measuring the cell length of a colony. This chart illustrates its data, which scientists have observed that there's still a measurement.