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posted by  Novaworks on 11/1/2009 5:51:38 PM  |  status: Closed  |  Earned Karma: 1145

True or False

Course Textbook Chapter Problem Needs by
Calculus Based Physics N/A N/A N/A 11/1/2009 at 10:00:00 PM
Question Details:
True or False

A 1 kg block moving along the x-axis has a velocity of 2m/s at x=0. It is subject to the force shown in the following graph. Use this information to answer the following questions.


1) The block maintains a constant speed from x=1 m to x=2 m.

2) The block speeds up from x=3 m to x=4 m.

3) The block is moving at a higher speed at 3 m than at 0 m.
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Oracle
Karma Points: 130,269
posted by Altair on 11/1/2009 6:00:53 PM  |  status: Live
Asker's Rating: Helpful   
Response Details:
1. False. Since between x = 1 and 2, the force is not zero, so acceleration is not zero. speed should increase.
2.
False
since from x=3 to x=4, the force is negative, so the acceleration is also negative (decreasing)
so the speed is decreasing during this.
3.
TRUE
since between  x= 1 and 3, the force is positive so as the acceleration, it speed up during this time
so at x = 3, the speed is higher than at x = 0

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