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find out motion of tree , boy and ...


find out motion of tree , boy and old man as seen by bird

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with respect to bird `: V_("tree ") = 12 m//s ( darr )and 16 m//s ( darr)`
` V_(" old man") = 18 m//s ( darr ) and 12 m//s ( darr )`
` V_("boy") = 12 m//s (darr)`
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