Question

pleass solve the above question whose answer is 4u^2/g

Answer 1

Hi  Dear !
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Speed = u 

h=v^2 / 2g 

h= 9u^2/ 2g 

Answer 2

Ahoy !!!

As we know the initial velocity = u 

Final velocity = v 

Using this eg. 

$v^{2}$- $u^{2}$ = 2gh 


9$u^{2}$ - $u^{2}$ = 2gh 

$\frac{ 8u^{2} }{2}$  = gh 

h= $\frac{ 4u^{2} }{g}$

May it helps you ^ _ ^