Speed of rocks when they hit the ground

  • Thread starter limonade
  • Start date
  • #1
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Homework Statement



If I throw a rock upwards with an initial velocity and throw a rock downwards, what is the speed of the rocks just before they hit the ground?

Homework Equations





The Attempt at a Solution

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They should hit the ground at the same speed and different times. I would use the conservation of mechanical energy, but someone I'm speaking to disagrees with me that they have same speed.

How would you show this mathematically?
 

Answers and Replies

  • #2
SteamKing
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Use the formulas for objects traveling in a gravity field. You are studying physics, I presume.
 
  • #3
301
7
See your initial kinetic energy is the final potential energy.
use this relation.
 

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