Is average velocity always half the sum of initial and final velocities?

[kitle545]

true/false;explain: the average velocity always equals one-half the sum of initial plus final velocities.

 

[mossfan563]

That's actually the formula for uniform acceleration.

 

[nicksauce]

Let's say I drive my car for an hour at 100km/h, then I crash into a wall and instantaneously come to a halt. What was my average velocity during the trip? What is 1/2(Vo+Vf)?