PLEASE HELP
What information is needed to determine the average velocity of a marble?

A.
the mass of the marble and the force it was rolled with

B.
the displacement of the marble and the change in time over which the displacement occurred

C.
the distance per unit time

D.
the mass of the marble and the amount of gravity acting on the marble

Question

PLEASE HELP
What information is needed to determine the average velocity of a marble? 	
	
 
A.
	the mass of the marble and the force it was rolled with
	
 
B.
	the displacement of the marble and the change in time over which the displacement occurred
	
 
C.
	the distance per unit time
	
 
D.
	the mass of the marble and the amount of gravity acting on the marble

anonymous · Answer

look here it might help http://www.wies-ms.eu.dodea.edu/Science/6th/Chap19.pdf

anonymous · Answer

Okay Thank you! (:

anonymous · Answer

Still can't understand...

anonymous · Answer

It's obvious the answer is B, why? because the average velocity is defined this way in the mathematical model of describing physical phenomena: $$V(average)=\Delta x/\Delta t$$
in order to find the instant velocity of the object you should take derivative of the function which gives you the exact place of the object at specific time.
Good luck ./