- #1
P944
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Homework Statement
While riding on an elevator descending with a constant speed of 3.3 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, 1.0 m below your arm?
(b) What is the book's speed relative to you when it hits the elevator floor?
Homework Equations
v = v0 + a*t
x = x0 + v0 *t + 1/2*a*t^2
x= x0 + v*t-1/2*a*t^2
V^2 = v0^2 +2*a*(x-x0)
The Attempt at a Solution
I tried to solve for time by first solving for final velocity using V^2 = v0^2+2*a*(x-x0) =
V^2 = (3.3m/s)^2 +2(-9.80m/s^2)(0-1m)
V^2 = 30.49 m^2/S^2
square root of 30.49 = 5.522 m/s
v = v0 +a*t
5.522 = 3.3 + (9.80)*t
t = 0.2267
part b) substract the book's velocity 5.522 - my velocity 3.3 = 2.222
I got both answers wrong. I was wondering if someone could help me explain what i did wrong? thank you so much!