if an object starts at rest and moves 90 meters south along straight line for 3 seconds , what is an average velocity?

A. 30 m/s
B. 30m/s, South
C. 270m/s, South

Question

if an object starts at rest and moves 90 meters south along straight line for 3 seconds , what is an average velocity?

A. 30 m/s
B. 30m/s, South
C. 270m/s, South

sapphiremoon · Answer

Average velocity is a measure of how far something goes, how fast, and in what direction. The formula is displacement/time, so you need to know how far away the object is from its original position, then divide that distance by the time it took to get there. Does that help you out?

learner · Answer

The average velocity is given by the following formula:

$\color{black}{\rm \displaystyle velocity=\frac{distance}{time}}$

learner · Answer

In your case,

$\color{black}{\rm distance~-~~90~meters.}$
$\color{black}{~~~~~{\tiny~~~}\rm time~-~~3~times.}$

osprey · Answer

A. It is 90 metres in a straight line in three seconds. That's 90/3 metres per second on average. The question says from rest, so that there will be acceleration in there, but the AVERAGE velocity "takes account" of that (arguably by ignoring it) and calculates the TOTAL distance covered by the TOTAL time taken to cover the distance. There's no other detail in either the question nor the calculation. Bon chance Watch out for mercury ... http://perendis.webs.com