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An object A of mass 1 kg is projected ve...

An object A of mass `1 kg` is projected vertically upward with a speed of `20 m//s`. At the same moment another object B of mass `3 kg`, which in intially above the object A, is dropped from a height `h = 20 m`. The two point like objects (A and B) collision and stick to each other. The kinetic energy is K (in J) of the combined mass after collision, find the value of `K//25`.

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