Calculate height and velocity given kinetic and potential?

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SUMMARY

The discussion focuses on calculating height and velocity from given potential energy (PE) and kinetic energy (KE) values using the equations KE = 1/2mv^2 and U = mgh. The user is tasked with filling in a table where PE and KE are provided, but height and velocity are unknown. It is established that height can be expressed as a function of mass, specifically h = PE/(mg), and that conservation of energy principles can be applied to relate different states of the same object.

PREREQUISITES
  • Understanding of kinetic energy (KE) and potential energy (PE) equations
  • Familiarity with the concept of conservation of energy
  • Basic algebra skills for manipulating equations
  • Knowledge of gravitational acceleration (approximately 9.8 m/s²)
NEXT STEPS
  • Explore the application of conservation of energy in physics problems
  • Learn how to manipulate equations involving kinetic and potential energy
  • Investigate the relationship between mass, height, and gravitational potential energy
  • Study examples of energy conservation in different physical systems
USEFUL FOR

Students studying physics, educators teaching energy concepts, and anyone looking to understand the relationship between kinetic and potential energy in mechanical systems.

JohnDoe624
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Homework Statement


I have a table that needs to be filled out. In each column, potential and kinetic energy are given, but height and velocity are left blank. Ex: PE = 20 J, KE = 0 J, h = ?, V = ?

Homework Equations


KE = 1/2mv^2
U = mgh

The Attempt at a Solution


I'm totally stumped. How can I figure out either of these with no mass given?
 
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Could you simply write height as a multiple of mass?
i.e. if PE = 20J ##h = \frac{20}{9.8 m} ## where m is in kg.
 
Forum rules require you to post the question word for word.
JohnDoe624 said:
KE = 0J ... V = ?
You should be able to do that one.

As for the other entries in the table... Do they relate to the same object at different times? Perhaps try applying conservation of energy between two rows in the table.
 

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