Answer:
Force exerted, F = 1.5 N
Explanation:
It is given that, a boxer punches a sheet of paper in midair and brings it from rest up to a speed of 30 m/s in 0.060 s.
i.e. u = 0
v = 30 m/s
Time taken, t = 0.06 s
Mass of the paper, m = 0.003 kg
We need to find the force the boxer exert on it. The force can be calculated using second law of motion as :



F = 1.5 N
So, the force the boxer exert on the paper is 1.5 N. Hence, this is the required solution.
 
        
             
        
        
        
Answer is A) Fulcrum
The fixed point that a lever rotates around is called the fulcrum.
        
                    
             
        
        
        
Answer:
B. 24.2 m/s
Explanation:
Given;
mass of the roller coaster, m = 450 kg
height of the roller coaster, h = 30 m
The maximum potential energy of the roller coaster  due to its height is given by;



Therefore, the maximum speed of the roller coaster is 24.2 m/s.
 
        
             
        
        
        
Answer:
For the first one its about 25 feet
Explanation:
 
        
                    
             
        
        
        
Answer:
The first answer is W and Z, since they appear to be a period apart. Dont know the second question. I did what I could, hope someone can answer the second.