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Valter edited
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+### Statement
+
+$2.2.10.$ [Insert the problem statement]
+
+### Solution
+
+### Statement
+
+$2.2.10.$ A spaceship had a velocity $v$ before the separation of the last stage of the launch vehicle. After discarding the last stage, its velocity became $1.01v$, while the separated stage moves away relative to the ship with a velocity of $0.04v$. What is the mass of the last stage if the mass of the ship is $m_0$?
+
+### Solution
+
+Let's write the law of conservation of momentum in projection onto the axis of the ship's motion:
+$$(m_0 + m_2)v = 1.01m_0 v + (1.01 - 0.04)m_2 v$$
+
+From which we obtain:
+$$0.03m_2 = 0.01m_0 \implies m_2 = m_0 / 3$$
+
+#### Answer
+$m = m_0 / 3$
+
+#### Answer
+
+[Insert a concise answer or boxed result]