Ball-A-is-dropped-from-the-top-of-a-building-At-the-same-instant-ball-B-is-thrown-vertically-upwards-from-the-ground-When-the-ball-collide-they-are-moving-in-opposite-directions-and-the-speed-of-A

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Question Number 17935 by Rishabh#1 last updated on 12/Jul/17

$$\mathrm{Ball}A\mathrm{is}\mathrm{dropped}\mathrm{from}\mathrm{the}\mathrm{top}\mathrm{of}\mathrm{a}\mathrm{building}.$$$$\mathrm{At}\mathrm{the}\mathrm{same}\mathrm{instant}\mathrm{ball}B\mathrm{is}\mathrm{thrown}$$$$\mathrm{vertically}\mathrm{upwards}\mathrm{from}\mathrm{the}\mathrm{ground}.$$$$\mathrm{When}\mathrm{the}\mathrm{ball}\mathrm{collide},\mathrm{they}\mathrm{are}\mathrm{moving}\mathrm{in}$$$$\mathrm{opposite}\mathrm{directions}\mathrm{and}\mathrm{the}\mathrm{speed}\mathrm{of}A\left(u\right)$$$$\mathrm{is}\mathrm{twice}\mathrm{the}\mathrm{speed}\mathrm{of}B.\mathrm{The}\mathrm{relative}$$$$\mathrm{velocity}\mathrm{of}\mathrm{the}\mathrm{ball}\mathrm{just}\mathrm{before}\mathrm{collision}$$$$\mathrm{and}\mathrm{relative}\mathrm{acceleration}\mathrm{between}\mathrm{them}$$$$\mathrm{is}\left(\mathrm{only}\mathrm{their}\mathrm{magnitudes}\right)$$$$\left(\mathrm{A}\right)0\mathrm{and}0\left(\mathrm{B}\right)\frac{3u}{2}\mathrm{and}0$$$$\left(\mathrm{C}\right)\frac{3u}{2}\mathrm{and}2g\left(\mathrm{D}\right)\frac{3u}{2}\mathrm{and}g$$

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