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4. An object, initially travelling at 45 m/s [N], explodes into three pieces. Afterward, the first piece
has a mass of 6kg, and travels at 68 m/s [N25E]. The second piece has a mass of 2.5kg, and
obtains a new velocity of 26 m/s [N75W].
a) If the third piece has a mass of 4kg, determine its vector velocity after the explosion.
b) Determine the change in energy.

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