# NCERT Class 11 Physics Solutions: Chapter 3 – Motion in a Straight Line Part 2

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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: