Physics
posted by Priscilla .
1. While riding on an elevator descending with a constant speed of 1.5 m/s, you accidentally drop a book form 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 your book's speed relative to you when it hits the elevator floor?
2. To celebrate a victory, a pitcher throws her glove straight upward with an initial speed of 6.0m/s.
(a) How long does it take for the glove to return to the pitcher?
(b) How long does it take for the glove to reach its maximum height?
1a)
v = 3 m/s
h = 1.2 m
t = ?
Vf = ?
V = Vi + at
3 m/s = 0 + (9.8 m/s^2)(t)
t = .30 s
1b) Vf = Vi + at
Vf = 0 + (9.8m/s^2)(.30 s)
Vf = 2.94 m/s
2a & b)
Vi = 6 m/s
t1 = ?
t2 = ?
I'm really confused with this problem since only one quantity is given. But I don't think we can assume that final speed is 0 m/s.
Respond to this Question
Similar Questions

physics
An elevator without a ceiling is ascending with a constant speed of 10m/s. A boy on the elevator shoots a ball directly upward, from a height of 2.0m above the elevator floor, just as the elevator floor is 28m above the ground. The … 
physics
A weight is hung by a cord from the ceiling of an elevator. From the following conditions, choose the one in which the tension of the cord would be the greatest...least? 
physics
An elevator without a ceiling is ascending with a constant speed of 9.7 m/s. A boy on the elevator shoots a ball directly upward, from a height of 2.0 m above the elevator floor, just as the elevator floor is 25 m above the ground. … 
physics
It takes the elevator in a skyscraper 3.6 s to reach its cruising speed of 10 m/s. A 69 kg passenger gets aboard on the ground floor. 1.What is the passenger's weight before the elevator starts moving? 
physics
A 83kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.76 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative … 
Physics
WOMAN IN ELEVATOR A woman weighs Fg= 650 N when standing on a stationary scale. Now, the woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from … 
physics
In Example 5.8 in the text book, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0 kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed … 
Physics
An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary? 
Physics
An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary? 
Physics
An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary?