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Ankit Kumar 6 years, 9 months ago
we have the equation
V2 = U2 - 2*g*h;
as V= U/2;
so putting the value of V in above equation
(U/2)2=U2-2*g*h
2*g*h= U2 - (U/2)2
2*g*h= 3*U2/4;
h=3*U2/(8*g)........................................eq. 1
now we have to calculate the value of U;
if H is the total height;
then accroding to v2=U2-2*g*H;
v=0;
we get
U2 = 2*g*H
U2= 2*9.81*16;
U= 17.69 m/s
so required height can be calculated form equation 1 as h= 11.96 m
1Thank You