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The two masses below are initially moving, collide, and stick together.
M1= 30kg and V1i = 15 m/s; M2=5kg and V2i= 10 m/s. Calculate their
combined final velocity after sticking together Vf.

Perfectly Inelastic Collisions
When two objects stick
together after the
collision, they have
undergone a perfectly
inelastic collision
After collision
• Conservation of
momentum becomes
m1 + m2
+x
m,v +m,V = (m, +m,)v,
1i
2i

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