Posted by **Daisy** on Thursday, November 1, 2012 at 6:34pm.

A gadget of mass 17.85 kg ﬂoats in space

without motion. Because of some internal

malfunction, the gadget violently breaks up into 3 fragments ﬂying away from each other.

The ﬁrst fragment has mass m1 = 4.12 kg

and speed v1 = 3.57 m/s while the second

fragment has mass m2 = 8.02 kg and speed

v2 = 6.03 m/s. The angle between the velocity vectors ~v1 and ~v2 is θ12 = 95

◦

What is the speed v3 of the third fragment?

Answer in units of m/s

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