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Q. No.A ball is bouncing elastically with a speed of \(1\) m/s between walls of a railway compartment of size \(10\) m in a direction perpendicular to the walls. The train is moving at a constant velocity of \(10\) m/s parallel to the direction of motion of the ball. As seen from the ground:
Choose the correct option from the given ones:
| (a) | The direction of motion of the ball changes every \(10\) s. |
| (b) | The speed of the ball changes every \(10\) s. |
| (c) | The average speed of the ball over any \(20\) s interval is fixed. |
| (d) | The acceleration of the ball is the same as from the train. |
| 1. | (a) and (d) only |
| 2. | (b), (c), and (d) only |
| 3. | (a), (b), and (c) only |
| 4. | None of the above |
Subtopic: Relative Motion |
From NCERT
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