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A small ball is projected horizontally b...

A small ball is projected horizontally between two large blocks. The ball is given a velocity `V ms^(-1)` and each of the large blocks move uniformly with a velocity of `2V ms^(-1)`. The ball collides elastically with the blocks. If the velocity of the blocks do not change due to the collision, then find out the velocity of the ball after the `2nd` collision.

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