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A mass of 3M moving at a speed v collid...

A mass of 3M moving at a speed v collides with a mass of M moving directly towards it, also with a speed v .If the collision is completely elastic, the total kinetic energy after the collision is `K_(e)`.If the masses stick together,the total kinetic energy after the collision is `K_(s)` .What is the ratio `(K_(e))/(K_(s))`?

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