A brick of mass 1kg travels to the right at 0.9c, where c is the speed of light. It collides with another brick of mass 2kg which is at rest before the collision. After the collision, the lighter brick has a speed of 0.35c, still to the right. What is the momentum of the heavier brick after the collision? Keep three significant digits. (Hint: be careful to use the relativistic expressions for momentum)

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