Answer:
Mike can travel 80 Km in 4 hours
 
        
             
        
        
        
Answer:
Mount Everest formed from a tectonic smashup between the Indian and Eurasian tectonic plates tens of millions of years ago.
Explanation:
 
        
             
        
        
        
Answer:
Height. 
Explanation:
Potential energy can be defined as an energy possessed by an object or body due to its position. 
Mathematically, potential energy is given by the formula;

Where, 
P.E represents potential energy measured in Joules.
m represents the mass of an object. 
g represents acceleration due to gravity measured in meters per seconds square. 
h represents the height measured in meters. 
Hence, the property of the object (having a mass of 5 kilograms) which must differ to have different gravitational potential energies is the height from which they are falling from.
The object having the higher height would have a greater gravitational potential energy than the lower object.