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A man of mass 50 kg starts moving on the earth and acquires speed of 1.8 m/s. with what speed does the earth recoil? Mass of earth =`6xx10^24kg.`

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`m_1v_1=m_2v_2`
`rarr 50xx1.8=6xx10^24xxv_2`
`:. v_2=(50xx1.8)/(6xx10^24)`
`15xx10^-24m/sec`
`=1.5xx10^-23 m/sec`
So, the earth will recoil at a speed of `1.5xx10^-23m/sec`.
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