Answer:D increase in frequency 
Explanation:
 
        
             
        
        
        
<h3>
Answer:</h3>
49 N 
<h3>
Explanation:</h3>
<u>We are given;</u>
- Mass of the brick as 3 kg 
- The coefficient of friction as 0.6 
We are required to determine the force that must be applied by the woman so the brick does not fall.
- We need to importantly note that;
- For the brick not to fall the, the force due to gravity is equal to the friction force acting on the brick.
- That is; Friction force = Mg 
But; Friction force = μ F
Therefore;
 μ F = mg 
0.6 F = 3 × 9.8 
 0.6 F = 29.4 
       F = 49 N 
Therefore, she must use a force of 49 N
 
        
        
        
Answer:
Explanation:
This does not violate Newton's 1st law because the net force would still be 0 in order to produce uniform motion (aka constant velocity). The other forces acting on the vehicles is air resistance which is non-zero. So we need car internal force to counter balance this force, which require extra gas for the car.
 
        
             
        
        
        
Mass is the amount of matter in a material while weight is a measure of how the force of gravity acts upon the mass. 
 
        
                    
             
        
        
        
Answer:
yes This is correct Answer