# Speed of Collision (physics)

**URL:** <https://forum.kirupa.com/t/speed-of-collision-physics/312291>\
**Category:** flash\
**Created:** [July 29, 2010, 8:42pm UTC](https://forum.kirupa.com/t/speed-of-collision-physics/312291 "2010-07-29T20:42:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ilikedragon](https://avatars.discourse-cdn.com/v4/letter/i/6bbea6/32.png) [@ilikedragon](https://forum.kirupa.com/u/ilikedragon)\
**Post date:** [July 29, 2010, 8:42pm UTC](https://forum.kirupa.com/t/speed-of-collision-physics/312291/1 "2010-07-29T20:42:36Z")

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Hi, I have a simple little physics problem.

I have the values (x, y, xSpeed, ySpeed) of the movieclips (Hero and Badguy)  
Now, when they collide, how will i calculate how hard the collision is?

Obviously weight, acceleration, etc. are out of the question, as it just needs to be based on their speeds.

Thanks in advance!