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What is the speed of the particles after collision?

Question 29
A point particle of mass 3.78 kg is moving with an initial
velocity of 2.87 m/s i. It collides and sticks to an object
of mass 4.03 moving at velocity of -1.61 m/s j before
collision. What is the speed of the particles after collision?
(round off your answer to 1 decimal place)

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