PHYSICS
posted by mark .
2 pool balls of equal mass experience a perfectly elastic head on collision. 1 ball is traveling at 2m/s and the other at 3m/s in the opposite direction.What is thier speed just after impact? I know the balls swap speed and change direction but can't find the correct formula to prove this. Please help!

PHYSICS 
drwls
There is a good derivation here. Be sure to set m1 = m2 to prove that thay switch velocities and directions.
http://blog.weber.k12.ut.us/jrhoades/files/2010/11/Ch7APNotesElasticCollisionFormula.pdf
Respond to this Question
Similar Questions

Physics
A ball of mass m1= .250 kg and velocity v01 = + 5 m/s collides headon with a ball of mass m2= .800 kg that is initially at rest (v02 = 0 m/s). No external forces act on the balls. If the collision is elastic, what are the velocities … 
Physics please help cant figure this out
starting with an initial speed of 5.00 m/s at a height of 0.265 m, a 1.75 kg ball swings downward and strikes a 4.45 kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find … 
physics
two balls collide in a head on elastic collision and rebound in opposite directions. One ball has velocity 1.2 before the collision and 2.3 after. the other ball has a mass of 1.1 kg and a velocity of 4.2 before the collision. What … 
physics collision
A 0.060 kg tennis ball, moving with a speed of 7.00 m/s has a headon collision with a 0.086 kg ball initially moving in the same direction at a speed of 3.10 m/s. Assume a perfectly elastic collision and take the initial direction … 
physics
Two pool balls of equall mass have a perfectly elastic headon collision.The fist ball is traveling at 2m/s and the second at 3m/s in the opposite direction.what are thier speeds immediately after impact? 
Physics IB
Two billiard balls of equal mass undergo a perfectly elastic headon collision. If the speed of ball 1 was initially 5.00 m/s, and that of ball 2 was 7.00 m/s in the opposite direction, what will be their speeds after the collision? 
Physics
Two Balls of masses mA = 45 grams and mB = 65 grams are suspended as follows: both Balls are hanging by a 30 cm string and are vertically parallel to each other. The lighter ball is pulled away to a 66 degree angle with the vertical … 
Physics
Starting with an initial speed of 5.00 m/s at a height of 0.335 m, a 1.75kg ball swings downward and strikes a 4.40kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find … 
college physics
two billiard balls of equal mass undergo a perfectly elastic collision. if the speed of one ball was initially 5.72 m/s and the other 1.64 m/s. what will their speeds be after the collision 
physics
Two balls have the same mass. One ball moving along the positive xaxis and the other ball moving along the positive yaxis undergo perfectly inelastic collision. What can you say about the motion of the balls after the collision?