What is the Relationship between Ticker-Tape Timer Tapes and Average Velocity?

[lingling]

Homework Statement

Refer to the uploaded file,
Which of the following statements is/are correct?
(1) The length of each tape represents the average velocity within the time interval.
(2) The width of the tape represents the constant time interval.
(3) Joining the centres of the tops of the tape gives a displacement-time graph.

A (2) only
B (3) only
C (1) and (2) only
D (1) and (3) only

Homework Equations

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The Attempt at a Solution

The answer is C.
But I don't understand why (1) is true.

 

[cristo]

Try uploading your image to imageshack.us, then post the link, since it may take a while for the attachment to be approved.

 

[billiards]

speed=distance/time

time=5 ticks=constant (for each column)

distance=length of column

so, if speed=avg velociy

avg velocity=length of column*constant

(note:constant=1/time)

or more simply: avg velocity is proportional to length of column