The momentum of an object is given by the equation $p = mv$, where $p$ is the momentum, $m$ is the mass, and $v$ is the velocity.
For the first object, with a mass of $900 \mathrm{kg}$ and a velocity of $0.850 c$, we have:
$p_1 = (900 \mathrm{kg})(0.850 c)$
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