Where are the statements? You forgot to attach them lol
        
             
        
        
        
Answer:
Explanation:
Y = 5 Sin27( .2x-3t) 
= 5 Sin(5.4x - 81 t )
Amplitude = 5 m 
Angular frequency ω = 81
frequency = ω / 2π
= 81 / (2 x 3.14 ) 
=12.89 
Wave length λ = 2π / k ,
k = 5.4
 λ = 2π / 5.4 
= 1.163 m
Phase velocity =ω / k
= 81 / 5.4
15 m / s. 
The wave is travelling in + ve x - direction. 
 
        
             
        
        
        
Answer:
C. Friction between the box and the floor is 25N to the left
Explanation:
 
        
                    
             
        
        
        
1 newton is the force needed to accelerate 1 kilogram of mass 
at the rate of 1 meter per second² .
         1 N = 1 kg-m/s² .
It's a force equal to roughly  3.6 ounces.