Which one is not an example of a point object?
1. | A railway carriage moving without jerks between two stations. |
2. | A monkey sitting on top of a man cycling smoothly on a circular track. |
3. | A plane under a journey of several thousand kilometres. |
4. | A tumbling beaker that has slipped off the edge of a table. |
A drunkard walking in a narrow lane takes \(5\) steps forward and \(3\) steps backward, followed again by \(5\) steps forward and \(3\) steps backward, and so on. Each step is \(1\) m long and requires \(1\) s. There is a pit on the road \(13\) m away from the starting point. The drunkard will fall into the pit after:
1. | \(37\) s | 2. | \(31\) s |
3. | \(29\) s | 4. | \(33\) s |