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Two particles of masses 1kg and 2kg resp...

Two particles of masses `1kg` and `2kg` respectively are initially `10m` aprt. At time `t=0`, they start moving towards each other with uniform speeds `2m//s` and `1m//s` respectively. Find the displacement of their centre of mass at `t=1s`.

Text Solution

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`S_(CM)=(m_1S_1+m_2S_2)/(m_1+m_2)`
`=(m_1(v_1t)+m_2(v_2t))/(m_1+m_2)`
`=((1)(2)(1)+(2)(-1)(1))/(1+2)`
`=0`
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