Calculating Ek At a specific point

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Homework Help Overview

The discussion revolves around calculating kinetic energy (Ek) at a specific point "B" using a given height of 50 meters. The original poster seeks clarification on the appropriateness of using this height in their calculations.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between kinetic energy and potential energy, questioning the use of height in the calculations. There is discussion about whether the height at point "B" should be considered, and the importance of the difference in height between points "A" and "B".

Discussion Status

Participants are actively engaging with the problem, with some guidance provided regarding the relationship between changes in kinetic and potential energy. The conversation indicates a productive exploration of the concepts involved, though no consensus has been reached on the specifics of the height usage.

Contextual Notes

There are indications that the diagram may be unclear, and there is a mention of missing units for height, which could affect the understanding of the problem.

Articulum
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Homework Statement



I need to find out the Ek at "B" this is the diagram i got i want to know if its right and if it is why do i use the Height of 50 to find out Ek at "B"

phys.jpg


Homework Equations



Ek=Ep

The Attempt at a Solution



Ek=Ep
Ek=m.g.h
Ek=100x9.8x50
Ek=49000J
 
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Welcome to PF!

Hi Articulum! Welcome to PF! :smile:
Articulum said:
I need to find out the Ek at "B" this is the diagram i got i want to know if its right and if it is why do i use the Height of 50 to find out Ek at "B"
…
Ek=Ep
Ek=m.g.h
Ek=100x9.8x50
Ek=49000J

Yes, that's right! …

(except it's really change in Ek = change in Ep) …

but why were you worried about using 50 for B? :smile:​
 


tiny-tim said:
Hi Articulum! Welcome to PF! :smile:


Yes, that's right! …

(except it's really change in Ek = change in Ep) …

but why were you worried about using 50 for B? :smile:​

If I'm figuring out Ek at "B" shouldn't i use the height also at "B"?
 
The *change* in kinetic energy plus the *change* in potential energy equals zero here: so you do need to use the height at B, or more precisely, what matters is the *difference* in height between A and B.

Probably the picture is badly drawn, I suppose the difference in height between A and B is 50m [the units for height are missing, too].
 
borgwal said:
The *change* in kinetic energy plus the *change* in potential energy equals zero here: so you do need to use the height at B, or more precisely, what matters is the *difference* in height between A and B.

Probably the picture is badly drawn, I suppose the difference in height between A and B is 50m [the units for height are missing, too].

So i use the Diffrence in height of where it starts and where the point is?
 
Articulum said:
So i use the Diffrence in height of where it starts and where the point is?

Exactly!
 
Thank you so much made my Physics work much easier
 

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