# NCERT Class 11 Physics Solutions: Chapter 3 – Motion in a Straight Line Part 2 (For CBSE, ICSE, IAS, NET, NRA 2023)

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**Question: 3.3**

A woman starts from her home at 9.00 am, walks with a speed of 5 km on a straight road up to her office 2.5 km away, stays at the office up to 5.00 pm, and returns home by an auto with a speed of 25 km Choose suitable scales and plot the graph of her motion.

**Answer**:

- Speed of the woman
- Distance between her office and home

Time taken

- It is given that she covers the same distance in the evening by an auto.
- Now, speed of the auto

Time taken

- The suitable graph of the motion of the woman is shown in the given figure.

**Question: 3.4**

A drunkard walking in a narrow lane taken 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. Plot the graph of his motion. Determine graphically and otherwise how long the drunkard takes to fall in a pit 13 m away from the start.

**Answer**:

- Distance covered with a step
- Time taken
- Time taken to move first 5 m forward
- Time taken to move 3 m backward
- Net distance covered
- Net time taken to cover
- Drunkard covers in . Drunkard covered in . Drunkard covered in . Drunkard covered 8 m in 32 s.
- In the next , the drunkard will cover a distance of and a total distance of and falls into the pit.
- Net time taken by the drunkard to cover
- The graph of the drunkard՚s motion can be shown as: