Chapters 1 and 2, January 28, 2004
Partial credit will be LIBERAL, provided that you show your work!
Use back if necessary!
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1.
(5 points)
Multiply 7.132
  m by 3.6

10
-3
, taking into account significant figures.
2.
(5 points) CONCEPTUAL QUESTION
The velocity of an object and the acceleration of an object are both vectors. Is it necessary that they both be in the same direction? Give a brief example to justify your answer.
3.
(20 points)
At time t = 0 the brakes are applied to a car at the origin which is initially traveling at
35.0 m/s along the positive x -axis. This causes the car to slow down at a constant acceleration of
–1.6 m/s 2 .
a.
How long after the brakes are applied does it take the car to stop? b.
What distance does the car go between the time the brakes are applied until it stops? c.
How far has the car moved after the brakes have been applied for 12 s ? d.
What is the car’s velocity
9 s after the brakes are applied?