Question

question

Answer 1

0=h+v0 *t+ 1/2 a t^2

0=h+ 0*8+ 1/2 *9.8 (9)
another equation for quater height
h-h/4=h+0*t+ 1/2 * 9.8* (t^2)

-h/4= 1/2 *9.8 *t^2

now solve for t

Answer 2

how will i find h and t together?

Answer 3

solve for h using first equation

0=h+ 0*8+ 1/2 *9.8 (8)^2
-h= 0*8+ 1/2 *9.8 (8)^2

h=-(0*8+ 1/2 *9.8 (8)^2)

Answer 4

then use that to solve for t in second equation . I let the computer do it and I got 4

for t

http://www.wolframalpha.com/input/?i=Solve%5B0%3Dh%2B%281%2F2*9.8*%288%29%5E2%29%2C-h%2F4%3D%281%2F2%29*9.8*t%5E2%5D

Answer 5

yeah 4 is the answer

Answer 6

wait come to physics

Answer 7

what ? i didnt get you