The initial momentum is given by: \(m_A \cdot v_{iA} + m_B \cdot v_{iB} = (3.5 kg)(5.0 m/s) + (3.5 kg)(-5.0 m/s) = 0\)
Since the collision is elastic, the total momentum before and after the collision is the same.
Let \(v_{fA}\) be the final velocity of sphere A.
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