Question

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

Answer 1

Running up a tree after running straight is a change in direction thus, although the speed is same 30mph, the velocity is different.

Answer 2

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).

Answer 3

When the cat is sitting still the whole time, its velocity is 0.0mph the entire time. That means the velocity doesn't change

Answer 4

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)

Answer 5

hope that helps.

Answer 6

yea thx, i though it could be the last one but didnt know