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A railway carriage of mass 9000 kg moving with a speed of 36kmh^(-1) collides with a stationary carriage of same mass. After thecollisiion of the carriage get coupled and move together. What is their common speed after collision? What type of collision is this? |
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Answer» Solution :`m_(1)=9000KG,u_(1)=36km//h=10m//s` `m_(2)=9000kg, u_(2)=0,v=v_(1)=v_(2)=?` By conservation of momentum `m_(1)u_(1)+m_(2)u_(2)=(m_(1)+m_(2))v` `:.v=5m//s` TOTAL K.E before collision `=1/2 m_(1)u_(1)^(2)+1/2m_(2)u_(2)^(2)` `=45000J` Total K.E. after collision `=1/2(m_(1)+m_(2))v^(2)=225000J` As totla K.E. after collision `gt` Total K.E. before collision |
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