The answers are a b c a a b a
        
                    
             
        
        
        
Answer
given,
wavelength of the red light,λ = 687 nm
wavelength of the yellow light = 582 nm
Frequency of red light 
=
=
= 4.36 x 10¹⁴ Hz
frequency of the yellow light
=
= 5.15 x 10¹⁴ Hz
speed of the car
 
v_r is the required speed.
  
 v_r = 0.19 c
 v_r = 0.19 x 3 x 10⁸ =5.7 x 10⁷ m/s
 1 m/s = 2.23694 mile/hr
v_r = 1.27 x 10⁸ mile/hr
if the light is actually yellow 
f₀ = 5.15 x 10¹⁴ Hz
 
 f = 6.13 x 10¹⁴ Hz
wavelength corresponding to this frequency is wavelength = 493.2 nm
hence, the color corresponding to this wavelength is Green.
 
        
             
        
        
        
1. 6.0 m
force/mass× acceleration is the equation
since the accelaration is unknown you would divide 180 by the mass of 30kg which is 6
2.A
        
             
        
        
        
Answer:
Parabolic motion
Explanation:
It is given that, 
Speed with which a baseball is launched through the ar, v = 37 m/s
Angle of projection, 
We know that when an object is projected with some initial speed having some angle of projection, the path followed by the object is called projectile motion. The object will act as a projectile here. As a result the shape of the trajectory will be parabolic. 
The equation of parabolic path is given by :

It is similar to,
 which is the equation of parabola
 which is the equation of parabola
Hence, this is the required solution.