Physics Review Question Unit: Energy Year: 1989 Question#: 4 Question: Base your answer to the question below on the diagram which represents a block sliding along a frictionless surface from A to G. Which formula represents the velocity of the block as it moves along the horizontal surface from point E to point F? (1 ) = s/ t (2 ) = v/2 (3 ) vf2=2a s (4 ) v=1/2a t2 What is this question really asking? Explanation by: Anna R [ Return to question menu ] Answer 1 = s/ t CORRECT = s/ t is the change in displacement divided by the change in time, which is the average velocity of an object. return to top Answer 2 = v/2 INCORRECT Sorry, this formula is nonsense. return to top Answer 3 vf2=2a s INCORRECT Sorry, this is the formula for final velocity if the initial velocity is zero. return to top Answer 4 v=1/2a t2 INCORRECT Sorry, this is the formula for change in velocity, not average velocity. return to top What's this question really asking? The formula for average velocity and if you know how to manipulate it. return to top This web site is designed and maintained by Science Joy Wagon and may not be reproduced or redistributed without written permission from Science Joy Wagon. Contact with comments.