How do you know when a ball is a vertical component of the velocity of zero?

Question

kainui · Answer

Well what does a velocity of zero mean to you?

anonymous · Answer

I do not know what the velocity of zero is? I am thinking it is the highest point the  object being thrown reaches.

kainui · Answer

Velocity is the same thing as speed, except that it also tells you a direction. So if your speed is 0, then your velocity is 0 too.

At the highest point is when the object stops moving up and is right before it starts moving down, and that's where the velocity is 0, you're right.

anonymous · Answer

vertical velocity is 0 at the top of the arc that a thrown ball travels along in free-fall. Even if the ball still has a horizontal velocity, it has 0 vertical velocity at the top of the arc.

anonymous · Answer

which is why speed and velocity are different. It can still have speed in a horizontal direction but have 0 vertical velocity.

kainui · Answer

@oddfishout Wrong, that's not why speed and velocity are different. Velocity is something that an object can have in both horizontal and vertical positions. |dw:1355902510444:dw|

anonymous · Answer

yes but velocity specifies direction. speed does not. speed is just the overall movement, velocity singles out a component of the movement such as vertical or horizontal or any single direction. something can have speed even though it is at the top of its arc pathway and has no vertical velocity.

vincent-lyon.fr · Answer

@Kanui
What you say is correct in its own words, but please read initial question again as you are answering a different question.

@oddfishout has given the correct answer to @bonnita18's question.