What happens when a ball is thrown vertically in the air?

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Homework Help Overview

The discussion revolves around the physics of a ball thrown vertically upward and the behavior of its speed, velocity, and acceleration at maximum height. Participants are exploring the definitions and relationships between these quantities in the context of motion under gravity.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning which quantities are zero at maximum height, with an emphasis on the distinction between speed and velocity. There is an exploration of the reasoning behind the original poster's answer and a discussion about the definitions of speed and velocity.

Discussion Status

The discussion is active, with participants engaging in clarifying concepts and definitions. Some guidance has been provided regarding the relationship between speed and velocity, leading to a reconsideration of the original answer.

Contextual Notes

The original poster expressed uncertainty after receiving feedback on their answer, indicating a potential misunderstanding of the concepts involved. There is also a mention of a separate math problem that remains unaddressed, suggesting a broader context of homework assistance.

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Homework Statement


A ball is thrown vertically in the air, upward from the surface of the Earth. Which of the following quantities are zero when the ball reaches maximum height?
a)speed b)velocity c)acceleration


Homework Equations





The Attempt at a Solution


i answered just b, but i got it marked wrong so i am unsure. any thoughts?
 
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What's the reasoning behind your answer?
 
because when the ball reached maximum height, the ball stops and then changes direction, so then it would have v=0 and the top. but would the speed be 0 as well?
 
You tell me. What's the relationship between speed and velocity?
 
velocity has to have direction while speed does not.
 
stephi said:
velocity has to have direction while speed does not.
Good. Speed is just the magnitude of the velocity. So how would you revise your first answer?
 
both speed and velocity will be zero?! :)
 
stephi said:
both speed and velocity will be zero?! :)
Of course. :smile:
 
thank you so much!
is there any chance you could also help me with a math problem that is giving me lots of trouble?
 
  • #10
stephi said:
is there any chance you could also help me with a math problem that is giving me lots of trouble?
Did you post it?
 
  • #11
yes but no replies yet,.
 

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