Answer:
it is accelerating 14 m/s
Explanation:
 
        
             
        
        
        
Answer:

Explanation:
By Snell's law we know at the left surface




now we have


now on the other surface we know that
angle of incidence = 

so again we have

so we have


also we know that


By solving above equation we have

 
        
                    
             
        
        
        
 Answer:
See below
Explanation:
Vertical position = 45 +  20 sin (30) t  - 4.9 t^2 
  when it hits ground this = 0
                0 = -4.9t^2 + 20 sin (30 ) t + 45 
                 0 = -4.9t^2 + 10 t +45 = 0     solve for t =4.22 sec
   max height is at  t= - b/2a = 10/9.8 =1.02
      use this value of 't' in the equation to calculate max height = 50.1 m
       it has  4.22 - 1.02 to free fall = 3.2 seconds free fall 
            v = at = 9.81 * 3.2 = 31.39 m/s VERTICAL
       it will <u>also</u> still have horizontal velocity =  20 cos 30 = 17.32 m/s 
         total velocity will be sqrt ( 31.39^2 + 17.32^2) = 35.85 m/s
Horizontal range = 20 cos 30  * t  =  20 *  cos 30  * 4.22 = 73.1 m 
 
        
             
        
        
        
Explanation:
Sorry but thee is none options for me to choose
 
        
             
        
        
        
While falling, both the sheet of paper and the paper ball experience air resistance. But the surface area of the sheet is much more than that of the spherical ball. And air resistance varies directly with surface area. Hence the sheet experiences more air resistance than the ball and it falls more slowly than the paper ball.
Hope that helps!