While riding on an elevator descending with a constant speed of 2.4 m/s...?

Question

While riding on an elevator descending with a constant speed of 2.4 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, 1.2 m below your arm?
s
(b) What is the book's speed relative to you when it hits the elevator floor?
m/s

Answer 1

The acceleration of the book will be g. So inside the elevator at constant speed it is if you are standing on the ground and drop the book.

so
1.2=.5*g*t^2
solve for t

with t
v=g*t downward

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