Posted by Kyle on Wednesday, March 17, 2010 at 12:03pm.
Two 72.0kg hockey players skating at 7.00 m/s collide and stick together. If the angle between their initial directions was 130 degrees , what is their speed after the collision?

physics  drwls, Wednesday, March 17, 2010 at 1:11pm
Use conservation of momentum in two perpendicular directions. Because of the equal speeds, the final direction will bisect the angle between the incoming vectors. You can write a single momentum equation along that direction, and solve for final speed Vfinal
2*72 * cos 65*7.00 m/s= 2*72 * Vfinal
Vfinal = 7.0 cos 65