Recall the vertical motion for when an object is dropped: h=-16t^2 + s where h = the height (feet), t = time in motion (seconds), and s = initial height (feet). If you drop a water balloon from a window 40 feet above the ground, then how long will it take for the water balloon to hit the ground? HELP ME!

Question

anonymous · Answer

s=40
solve for t when h=0

anonymous · Answer

how exactly will the equation look when i solve for t?

anonymous · Answer

0=-16t^2 +40
solve for t

anonymous · Answer

subtract 40, divide by -16, find the square root

anonymous · Answer

will it look kinda like this before i solve for the square root? 5/2=t^2

anonymous · Answer

what the heck is the answer then? im, so terrible at math its unbelievable

anonymous · Answer

t=sqrt{40/16}
got a calculator?

anonymous · Answer

no. its lost

anonymous · Answer

oh i simplified thats where i got 5/2 but still.... no comprende

anonymous · Answer

ok i got this but its wrong, i feel it. sqrt 10 over sqrt 2