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Learning Goal: To learn to use images of an object in motion to determine velocity and acceleration.

Two toy rockets are traveling in the same direction (taken to be the x axis). A diagram is shown of a time-exposure image where a stroboscope has illuminated the rockets at the uniform time intervals indicated.

1) At what time(s) do the rockets have the same velocity?

``````at time t = 1 only

at time t = 4 only

at times t = 1 and t = 4

at some instant in time between t = 1 and t = 4

at no time shown in the figure``````

2) At what time(s) do the two rockets have the same acceleration?

``````at time t = 1 only

at time t = 4 only

at times t = 1 and t = 4

at some instant in time between t = 1 and t = 4

at no time shown in the figure``````

3) The motion of the rocket labeled A is an example of motion with uniform (i.e., constant) __.

``````and nonzero acceleration

velocity

displacement

time``````

4) The motion of the rocket labeled B is an example of motion with uniform (i.e., constant) __.

``````and nonzero acceleration

velocity

displacement

time``````

5) At what time(s) is rocket A ahead of rocket B?

``````before t = 1 only

after t = 4 only

before t = 1 and after t = 4

between t = 1 and t = 4

at no time(s) shown in the figure``````

• (1) At t = 1 and t = 4

(2) Never

(3) Uniform acceleration

(4) Velocity

(5) Before t = 1, after t = 4

Source(s): Not too shabby at these problems.
• 1)at times t = 1 and t = 4

2)at no time shown in the figure

3)and nonzero acceleration

4)velocity

5)before t = 1 and after t = 4

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