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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu
[mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf
Of Robert Cohen
Sent: Tuesday, September 11, 2007 9:24 AM
To: Forum for Physics Educators
Subject: [Phys-l] A simple (?) question about speed
Yesterday I asked my algebra-based physics I students the
following question (in-class via student response system,
after a week of discussion/homework/lecture on speed and
acceleration):
An object has an initial speed of 30 m/s and a final speed of 60 m/s.
Which of the following is correct?
A. The object's speed is constant.
B. The object's speed is not constant.
C. We are unable to determine whether the speed is constant
or not without more information.
At a certain moment, an object is sliding toward the left at
a speed of
3 m/s along a horizontal surface. You are given no
information on whether it is slowing down, speeding up or
moving with a constant speed.
What is its acceleration?
A. 3 m/s^2
B. 3 m/s
C. Cannot be specified without more information.