Problem 89P

While riding on an elevator descending with a constant speed of 3.0 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? (b) What is the book's speed relative to you when it hits the elevator floor?

Solution 89P

Step 1 of 3

The elevator is descending at a speed of: .

The distance between your arm and the floor of the elevator is: .

The book has to cover more distance than to reach the floor of the elevator, as by the time the elevator floor would have descended a distance of .

So, the total distance the book has to cover is: .--------(1)