Bro the md that she lost was the md boneless burger
        
             
        
        
        
Answer:
v = 10 m/s
Explanation:
recall that velocity is related to wavelength and frequency by the formula
v = fλ
where v = velocity, f = frequency and λ= wavelength
Simply substitute these into the formula:
v = fλ
v = (0.5)(20)
v = 10 m/s
 
        
                    
             
        
        
        
Answer:
Explanation:
Let the velocity after first collision be v₁ and v₂ of car A and B . car A will bounce back . 
velocity of approach = 1.5 - 0 = 1.5 
velocity of separation = v₁ + v₂ 
coefficient of restitution = velocity of separation / velocity of approach
 .8 = v₁ + v₂ / 1.5 
v₁ + v₂ = 1.2 
applying law of conservation of momentum 
m x 1.5 + 0 = mv₂ - mv₁
1.5 = v₂ - v₁
adding two equation 
2 v ₂= 2.7 
v₂ = 1.35 m /s 
v₁ = - .15 m / s 
During second collision , B will collide with stationary A . Same process will apply in this case also. Let velocity of B and A after collision be v₃ and v₄. 
For second collision , 
coefficient of restitution = velocity of separation / velocity of approach
 .5 = v₃ + v₄ / 1.35 
v₃ + v₄ = .675
applying law of conservation of momentum 
m x 1.35 + 0 = mv₄ - mv₃
1.35 = v₄ - v₃
adding two equation 
2 v ₄= 2.025
v₄ = 1.0125 m /s 
v₃ = - 0 .3375  m / s