May 9th, 2017, 04:12 AM  #1 
Member Joined: May 2016 From: Ireland Posts: 96 Thanks: 1  Collision
A smooth sphere P, of mass m kg, moving with speed 5u m/s collides directly with a smooth sphere Q, of mass 2m kg, moving towards each other with speed 2u m/s. The coefficient of restitution between the spheres is e. find the condition satisfied by e if the 2 spheres move in the same direction after the collision. using the 2 normal equations i got their final speeds to be 3u2ue and 3uue because they move in the same direction i let 3u2ue >0 and 3uue>0 solving these i get e<3 and e>3/2 the answer at the back of the book is e<1/14 i can go though my answer in more detail if you need it thanks 

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