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Grade: 12th pass
        
Please answer it fast. If possible please give diagram 
 
3 months ago

Answers : (1)

Arun
18618 Points
							
The ball is bit at x =0 y =1 m.
slope of stair case of benches
          =  increase in y / increase in x    =  height of step / width of step
The line joining the feet of the benches is =  (y - 1) / (x - 110 )  = 1 / 1
  y = x - 109     - - equation 1
Equation of trajectory of cricket ball is : 
x = u cos Ф t
t = x / u cos Ф
y  = u sinФ t - 1/2  g  t²
    = x tan Ф -  g x² / ( 2 u² cos² Ф )
y  =   1.327 x  -   9.8 * x² / (2 *35² * 0.362 )  
      =  1.327 x  -  0.011 x²    ---- equ 2 
substitute y from equation  1
x - 109 =1.327 x - 0.011 x²
0.011 x² - 0.327 x - 109 = 0
Δ = 4.9
x =  (0.327 +- 2.21 )/2*0.011  
x =  115.32  meters
y at 115.32 m   =  115.32 - 109 = 6.32 meters
So it is the 6th bench,  as 1st bench is from 110m to 111m,   6 th bench is from 115 m to 116m.
Height y  Back rest of the First bench is from  1 to 2 m  ,  
           back rest of the sixth bench is 6 to 7 meters high
6th bench
 
3 months ago
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