Answer:
The time of flight of the ball is 1.06 seconds.
Explanation:
Given 

Also, 

Let us say the velocity in the x-direction is  and in the y-direction is
 and in the y-direction is  . And acceleration in the x-direction is
. And acceleration in the x-direction is  and in the y-direction is
 and in the y-direction is  .
.
Also,  is distance covered in x and y direction respectively. And
 is distance covered in x and y direction respectively. And  is the time taken by the ball to hit the backboard.
 is the time taken by the ball to hit the backboard.
We can write  . Where
. Where  is velocity of ball.
 is velocity of ball.
Now,

 
Also, 
 .
.
Plugging this value in
 

So, the time of flight of the ball is 1.06 seconds.
 
        
             
        
        
        
Answer:
Explanation:
Entropy is the degree of randomness of a system which it can increases as the temperature of the reactants is increased to yield product.
 
        
             
        
        
        
A perfect black body can’t be realized
        
             
        
        
        
Here we can use coulomb's law to find the force between two charges
As per coulombs law
]tex]F = \frac{kq_1q_2}{r^2}[/tex]
here we have




now by using the above equation we have


so here the force between two charges is of above magnitude and this will be repulsive force between them as both charges are of same sign.
 
        
             
        
        
        
The formula of the kinetic energy is:

where m is a mass of the object, v is speed of the object at the moment of time. So we have:

The answer is 
2000 Joules.