A ball of clay of mass m1 = 0.37 kg is thrown in the x direction with an initial velocity of v = 28 m/s. It strikes a block of m2 = 4.2 kg initially at rest and sticks. Write an expression for the system's final velocity vf.  Assume the block had an initial velocity of vb in the positive x direction. Write an expression for the final velocity of the system.  If the block has an initial velocity of vb = 2.1 m/s, what is the final velocity of the system in meters per second?

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