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\[v^2=v_0^2-2gh\]
v=0 v_0=15 find h then use this formula to find out t
\[h=v _{i}t-\frac12g t^2\]

I found the total time it takes the ball to reach the apex but can't find the total time in flight?

it is 2 times reach to apex

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awesome! thanks

there is something wrong

what did you find t

1.5 s and total time 3 s

how about h?

is it 11.5

because t is not real, it is complex..

its initial speed is 15 right, can you check it again?

but I'am still curies why that eq. did not work

hence it's at the apex when v(t) = 0.

what if I want to solve problem using by those formulas, it must be worked, where am I making wrong?

no it is complex, and when I put t=1.5 right side is 0 left side is 11.25
and also \[\Delta <0\]

that's interesting when I accept g=9.8 it is not real

http://www.wolframalpha.com/input/?i=4.9t^2+-+15t+%2B+11.5+%3D+0

maybe their teacher said them to take g=10

what is the formula use in pascal's law?

I got it now because when I calculate h, I rounded it 11.5 but it s not
h=11.479591836735

for h=11.479591836735
http://www.wolframalpha.com/input/?i=4.9t^2+-+15t+%2B+11.479591836735+%3D+0

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