On a frictionless surface, a block of mass $$M$$ moving at speed $$v$$ collides elastically with another block of the same mass $$M$$ which is initially at rest. After the collision, the first block moves at an angle $$\theta$$ to its initial direction and has a speed $$\frac{v}{3}$$. The second block’s speed after the collision will be:

 1 $$\frac{2\sqrt{2}}{3}v$$ 2 $$\frac{3}{4}v$$ 3 $$\frac{3}{\sqrt{2}}v$$ 4 $$\frac{\sqrt{3}}{2}v$$
Subtopic:  Collisions |
66%
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NEET - 2015
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A stone is projected from a horizontal plane. It attains maximum height, 'H', and strikes a stationary smooth wall & falls on the ground vertically below the maximum height. Assuming the collision to be elastic, the height of the point on the wall where the ball will strike will be:

 1 $$\frac{H}{2}$$ 2 $$\frac{H}{4}$$ 3 $$\frac{3 H}{4}$$ 4 None of these
Subtopic:  Collisions |
53%
From NCERT
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