A body of mass 4.2kg moving with a velocity 10m/s dues east hit a ststionery body of 2.5kg if they stick together after collision and move velocity v dues east.Calculate the value of v  

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A assemblage of collectiveness 4.2kg moving succeeding a while a swiftness 10m/s dues east hit a ststionery assemblage of 2.5kg if they hold concomitantly succeeding opposition and propose swiftness v dues east.Calculate the rate of v  
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