Question

While riding on an elevator descending with a constant speed of 3.5 m/s, you accidentally drop a book from under your arm.
(a) How long does it take for the book to reach the elevator floor, 1.1 m below your arm?

Answer 1

i keep getting .235s

Answer 2

for some reason if i multiply that by 2 i get the correct answer!
but why?

Answer 3

\[\Delta x = v _{0} t +1/2 at ^{2}\]

Answer 4

x=-1.1 v0= -3.5 a=-9.8

Answer 5

set up quadratic equation to solve for t and then... ! stuck.