In a physics experiment, particle A is moving in positive x direction ( 1-D motion)

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In a physics experiment, particle A is moving in positive x direction ( 1-D motion). At time t = 2 s, particle A collides inelastically with particles B, which is initially at rest. The two particles stick together and move with a final speed of 8 m/s in positive x direction after the collision (totally inelastic collision). Mass of particle A is 1 kg and its velocity at any time before the collision is given by: v(t) = 4t^2 + @, where v is in m/s and t is in seconds.

Find the mass of particle B.