Two particles $$\(P\)$$ and $$\(Q\)$$, of masses $$\(0.2 \mathrm{~kg}\)$$ and $$\(0.5 \mathrm{~kg}\)$$ respectively, are at rest on a smooth horizontal plane. $$\(P\)$$ is projected towards $$\(Q\)$$ with speed $$\(2 \mathrm{~m} \mathrm{~s}^{-1}\)$$. After the collision $$\(P\)$$ continues to move in the same direction with speed $$\(0.3 \mathrm{~m} \mathrm{~s}^{-1}\)$$. Find the speed of $$\(Q\)$$ after the collision. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

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