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Calculate height and velocity given kinetic and potential?

  • #1

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?
 

Answers and Replies

  • #2
RUber
Homework Helper
1,687
344
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.
 
  • #3
CWatters
Science Advisor
Homework Helper
Gold Member
10,529
2,295
Forum rules require you to post the question word for word.
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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