Let's be clear:  The plane's "395 km/hr" is speed relative to the 
air, and the wind's "55 km/hr" is speed relative to the ground.
Before the wind hits, the plane moves east at 395 km/hr relative
to both the air AND the ground.
After the wind hits, the plane still maintains the same air-speed.
That is, its velocity relative to the air is still 395 km/hr east.
But the wind vector is added to the air-speed vector, and the 
plane's velocity <span>relative to the ground drops to 340 km/hr east</span>. 
        
             
        
        
        
Kinetic energy because the horse is in motion
        
             
        
        
        
Answer:
Period of the signal.
Explanation:
So, this question is all about a concept in physics or astronomy which is called or known as Radiation Astronomy and Galactic Nuclei that are active. This concept talks most about Quasars; a powerful radiating object which derives its power from black holes. 
When You take a look at Quasars, we get the to know that the more you think you can see, the more they move away from us. 
Thus, when "You are observing the radiation from a distant active galaxy and you notice that the amplitude of the signal varies in strength regularly over a certain period. The maximum possible size for the source of this radiation can now be calculated from the "PERIOD OF THE SIGNAL.
NB: not the amplitude but the period.
 
        
             
        
        
        
Answer:
Acceleration, 
Explanation:
It is given that,
Initial velocity of the car, u = 10 m/s (in right)
Final velocity of the car, v = -5 m/s (in left)  
Time taken, t = 10 s
Let a is the acceleration of the car. It can be calculated using the equation of kinematics. The equation is as :


 
     

So, the acceleration of the car is  . Hence, this is the required solution.
. Hence, this is the required solution.
 
        
             
        
        
        
Metallic bonds! Hope this helps!! :))