The letter D represents the wavelength
        
                    
             
        
        
        
Answer:
a)  x(t) = 10t + (2/3)*t^3
b) x*(0.1875) = 10.18 m
Explanation:
Note: The position of the horse is x = 2m. There is a typing error in the question. Otherwise, The solution to cubic equation holds a negative value of time t.
Given:
- v(t) = 10 + 2*t^2 (radar gun)
- x*(t) = 10 + 5t^2 + 3t^3  (our coordinate)
Find:
-The position x of horse as a function of time t in radar system.
-The position of the horse at x = 2m in our coordinate system
Solution:
- The position of horse according to radar gun:
                               v(t) = dx / dt = 10 + 2*t^2
- Separate variables:
                               dx = (10 + 2*t^2).dt
- Integrate over interval x = 0 @ t= 0
                               x(t) = 10t + (2/3)*t^3
- time @ x = 2 :
                               2 = 10t + (2/3)*t^3
                               0 = 10t + (2/3)*t^3 + 2
- solve for t:
                               t = 0.1875 s
- Evaluate x* at t = 0.1875 s
                               x*(0.1875) = 10 + 5(0.1875)^2 + 3(0.1875)^3
                               x*(0.1875) = 10.18 m
 
        
             
        
        
        
That ratio is 2 .
<h3>What is ratio?</h3>
A ratio is the  comparison of the  two numbers bydivision.
Taking the first two outputs, or the  -1/8 and -1/4, we can divide not the second one by the first one to find the
ratio:
-1/4-1/8
When dividing fractions, we multiply by the reciprocal:
-1/4x-8/1
To multiply fractions, multiply straight across:
(-1x-8)/(4x1) 8/4=2
To know more about ratio click-
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Explanation:
- Speed is the rate of change of distance with time. 
             Speed = 
- Velocity is given as the displacement per unit of time: 
              Velocity = 
Speed and velocity are similar but speed is a scalar quantity while velocity is a vector quantity. Speed has magnitude but does not point towards a specific direction. Velocity shows both magnitude and direction and it is a vector quantity. 
- Acceleration is given as the change in velocity with time. It is a vector quantity: 
                 Acceleration = 
- Distance is how far a body moves. It is scalar quantity. 
- Time is the duration of an event. It is a scalar quantity. 
Learn more: 
Vector calculation brainly.com/question/2678571
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