Masa is a concept that identifies that magnitude of a physical nature that allows indicating the amount of matter in a body. Within the International System , its unit is the kilogram ( kg . ) 
        
             
        
        
        
Answer:
10m/s^2
Explanation:
Force = mass x acceleration 
Acceleration = force/ mass
 = 20000000/2000000
 =10m/s^2
 
        
             
        
        
        
Density is directly proportional to mass. So if there's less matter inside object, its density will also reduce.
        
                    
             
        
        
        
Answer:
The speed of the wave with a frequency 100 mhz will be  
Explanation:
We have given that frequency of light is 100 mhz
We have to find the speed of light in vaccuum 
We know that all electromagnetic waves travels in vaccum wth the same speed as the speed of light 
And we know that speed of light is equal to 
So the speed of the wave with a frequency 100 mhz will be  