Answer:
Mass and Velocity
Explanation:
Momentum = Mass  X Velocity 
or p=m' x v 
since in physics p is quantity momentum and m stands for mass and v stands for velocity.
Hope this helps :)
 
        
             
        
        
        
Explanation: White light is all colors of light in one, so when white light passes through a prism, the light gets refracted and breaks apart into all of the colors on the visible light spectrum.
 
        
             
        
        
        
Answer:
The force of gravity exerts a downward force. The floor exerts an upward force. Since these two forces are of equal magnitude and in opposite directions, they balance each other.
 
        
             
        
        
        
Answer:
Explanation:
Given 
Initial reading on scale =40 N
So, we can conclude that weight of the sack is 40 N
After this a 10 N force is applied upward on the sack such that the net force becomes (40-10) N downward (because downward force is more)
This net downward force is the resultant of earth graviational pull and the applied upward force.
So, this downward force acts on the machine which inturn applies an upaward force of same magnitude called Normal reaction.
This situation can be diagramatically represented by figure given below  
 
        
             
        
        
        
Velocity = displacement/time
1.6 = 253/t
t = 158.125
It takes them about 158 seconds