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a. If a mass m_a = 2m has intial velocity 4m/s and mass m_b = m has intially veclocity -6m/s, they undergo elastic collision. Calculate the final velocities.

b. If a mass m_a = 2m has intial velocity 4m/s and mass m_b = m is initially at rest, they undergo elastic collision. Calculate their final velocities after the collision.

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