A small ball is projected horizontally between two large blocks. The ball is given a velocity \(...

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A small ball is projected horizontally between two large blocks. The ball is given a velocity \( v \mathrm{~ms}^{-1} \) and each of the large blocks move uniformly with a velocity of \( 2 v \mathrm{~ms}^{-1} \). 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 2 nd
Assume friction to be absent collision.
(1) \( 5 v \)
(2) \( 7 v \)
(3) \( 9 v_{1} \)
(4) none of these
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