What is the average speed of the marble as it rolls across the floor?

A.
1.33 m/s

B.
7.5 m/s

C.
0.75 m/s

D.
75 m/s

http://static.k12.com/calms_media/media/1357500_1358000/1357618/1/ef2d690a4b8ddde1c7c5e9b96dd7c45d444a2618/MS_PHYS_SCI_286556.jpg

Question

What is the average speed of the marble as it rolls across the floor?  
   
 
  
 
  
 

 
 

  

  A. 
  1.33 m/s   
   

 
 

  

  B. 
  7.5 m/s   
   

 
 

  

  C. 
  0.75 m/s   
   

 
 

  

  D. 
  75 m/s  
 
http://static.k12.com/calms_media/media/1357500_1358000/1357618/1/ef2d690a4b8ddde1c7c5e9b96dd7c45d444a2618/MS_PHYS_SCI_286556.jpg

anonymous · Answer

Average speed equals distance times (x) time but idk what numbers.

unknownrandom · Answer

I thought speed=distance/time.

anonymous · Answer

it is, I just accidentall left out the speed part.

anonymous · Answer

I think B?

unknownrandom · Answer

Ok, so find a number on the y-axis and divide it by a number on the x-axis. So I chose 3/4=.75 Which is C

unknownrandom · Answer

The y-axis is Distance and the x-axis is time in case you forgot.

anonymous · Answer

Ohhh Okay I get It! I just picked my own number to solve it which, is wrong.

unknownrandom · Answer

It doesn't matter which points you pick. You will always get the same answer as long as you make sure that is where they intersect.