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anonymous

  • one year ago

For which of the following is the velocity constant (speed/direction does not change)? A cat escaping a dog by running in a straight line and then up a tree at a constant speed of 30 mph. A cat escaping a dog by running in a straight line away from the dog and slowing down when danger is gone. A cat escaping a dog by running at a constant speed around and around the house until the dog gets bored. A cat ignoring the dog by sitting perfectly still. i think its the one where the cat went up the tree but was wondering if it could be the last one

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  1. SolomonZelman
    • one year ago
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    Running up a tree after running straight is a change in direction thus, although the speed is same 30mph, the velocity is different.

  2. SolomonZelman
    • one year ago
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    Now, in choice B, the cat is slowing down after having escaped from the dog. This is also a change in velocity (because the speed decreases).

  3. SolomonZelman
    • one year ago
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    When the cat is sitting still the whole time, its velocity is 0.0mph the entire time. That means the velocity doesn't change

  4. SolomonZelman
    • one year ago
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    And when the cat is running around the house, the cat is changing direction (thus velocity is different). (This is relevantly a circular motion, and acceleration is a non-zero constant, and thus veloicty of course isn't same)

  5. SolomonZelman
    • one year ago
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    hope that helps.

  6. anonymous
    • one year ago
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    yea thx, i though it could be the last one but didnt know

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