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Homework Statement
Two masses, m1 = 4 kg and m2 = 12 kg, have initial velocities of v1i = 28 m/s [+x 35 +y] and v2i = [-y 60 +x]. If the first mass has a final velocity of v1f = 18 m/s [-y 40 +x], find:
a). The final velocity of m2.
b). Whether or not the collision can be said to be elastic.
c). If a thirst mass, m3 = 8 kg with an initial velocity of v3i = 45 m/s [+x 75 +y], were to strike the 1st mass 5 sec after the initial collision took place, will the first 2 masses ever collide again, and if so, where? Justify your answer. (Assume that this collision is elastic).
Homework Equations
P = mv
Pi = Pf
Eki = Ekf
The Attempt at a Solution
a). Using Pi = Pf, I got the velocity of m2 to be 16 m/s [+x 11 +y].
b). The answer I got was that collision is inelastic because,
Eki != Ekf
L.S = 2744 J
R.S = 2184 J
Since L.S is not equal to R.S the collision isn't elastic.
c). Here's the problem. They haven't given any information as to what happens after the collision so I don't know how to use Pi = Pf or Eki = Ekf here. Anybody have any pointers on how to solve this?