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An object A of mass 2 kg is moving on a ...

An object A of mass 2 kg is moving on a frictionless horizontal track has perfectly inelastic collision with another object B of mass 3 kg made of the same material and moving in front of A in same direction their common speed after the collision is `4 m//s` Due to the collision the temperature of the two objects which was initially the same, is increased though only by `0.006^(@)` C What was the initial speed `(in m//s)` of the colliding object A before the collision?

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