Posted by **collisions** on Sunday, July 3, 2011 at 5:30pm.

Two masses are involved in an elastic collision. The first has a mass of 0.150 kg and an initial velocity of 0.900 m/s directed at an angle of 50 degrees with the positive y-axis as shown below. The second mass, of 0.260 kg moves along the x-axis with an initial velocity of 0.540 m/s. After the collision, the first mass has a velocity of 0.640 m/s at an angle of θ=11 degrees above the positive x-axis. The second mass has an angle φ, directed below the positive x-axis. Find the magnitude and direction of the second mass's final velocity. (answers given: φ = -35.09 degrees, and V2f= 0.703 m/s).

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**Damon**, Sunday, July 3, 2011 at 6:32pm
Not having your diagram, I do not know if the first mass is at 50 degrees from the y axis in quadrant 1 or quadrant 2

Therefore I can only tell you what to do

X momentum before = .15 * .9 cos40 (or -cos 40) + .26 *.540

=

X momentum after = .15*.64 cos 11 +or -.26*V2 cos phi

Y momentum before = .15*.9 cos 50 + 0

=

Y momentum after = .15*.9 sin 11 - .26*V2 sin phi

and

(1/2).15 (.9)^2 + (1/2).26(.54)^2

=

(1/2).15(.64)^2 + (1/2).26(V2)^2

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**collisions**, Sunday, July 3, 2011 at 7:08pm
its in quadrant 2, going in negative y direction. i already solved the answer though thanks!

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