Physics Part-I
Class 11
NCERT
1
Chapter 1: Physical World
16 questions
2
Chapter 2: Units and Measurements
51 questions
3
Chapter 3: Motion in Straight Line
50 questions
Q1
Explain clearly, with examples, the distinction between : (a) magnitude of displacement (sometimes called distance) over an interval of time, and the total length of path covered by a particle over the same interval; (b) magnitude of average velocity over an interval of time, and the average speed over the same interval. [Average speed of a particle over an interval of time is defined as the total path length divided by the time interval]. Show in both (a) and (b) that the second quantity is either greater than or equal to the first. When is the equality sign true ? [For simplicity, consider one-dimensional motion only].
Q2
A man walks on a straight road from his home to a market 2.5 km away with a speed of . Finding the market closed, he instantly turns and walks back home with a speed of . What is the magnitude of average velocity?
Q3
In Exercises 3.13 and 3.14, we have carefully distinguished between average speed and magnitude of average velocity. No such distinction is necessary when we consider instantaneous speed and magnitude of velocity. The instantaneous speed is always equal to the magnitude of instantaneous velocity. Why?
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Chapter 4: Motion in a Plane
43 questions
5
Chapter 5: Laws of motion
52 questions
6
Chapter 6: Work, Energy and Power
41 questions
7
Chapter 7: System of Particles and Rotational Motion
45 questions
8
Chapter 8: Gravitation
33 questions
Question
Easy
Solving time: 3 mins
A man walks on a straight road from his home to a market 2.5 km away with a speed of . Finding the market closed, he instantly turns and walks back home with a speed of . What is the magnitude of average velocity?
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Text solution
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Average velocity = Total Displacement/ Total Time
Because, at the end displacement = 0 m.
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Practice more questions from Physics Part-I (NCERT)
Q1
Explain clearly, with examples, the distinction between : (a) magnitude of displacement (sometimes called distance) over an interval of time, and the total length of path covered by a particle over the same interval; (b) magnitude of average velocity over an interval of time, and the average speed over the same interval. [Average speed of a particle over an interval of time is defined as the total path length divided by the time interval]. Show in both (a) and (b) that the second quantity is either greater than or equal to the first. When is the equality sign true ? [For simplicity, consider one-dimensional motion only].
Q2
A man walks on a straight road from his home to a market 2.5 km away with a speed of . Finding the market closed, he instantly turns and walks back home with a speed of . What is the magnitude of average velocity?
Q3
In Exercises 3.13 and 3.14, we have carefully distinguished between average speed and magnitude of average velocity. No such distinction is necessary when we consider instantaneous speed and magnitude of velocity. The instantaneous speed is always equal to the magnitude of instantaneous velocity. Why?
View allPractice questions from Physics Part-I (NCERT)
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(f) area under the v-t curve bounded by the t-axis and the dotted line shown.
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Question 3
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You can measure your reaction time by a simple experiment. Take a ruler and ask your friend to drop it vertically through the gap between your thumb and forefinger (Figure). After you catch it, find the distance traveled by the ruler. In a particular case, was found to be . Estimate reaction time.
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| Question Text | A man walks on a straight road from his home to a market 2.5 km away with a speed of . Finding the market closed, he instantly turns and walks back home with a speed of . What is the magnitude of average velocity? |
| Updated On | Jun 25, 2023 |
| Topic | Motion in Straight Line |
| Subject | Physics |
| Class | Class 11 |
| Answer Type | Text solution:1 Video solution: 3 |
| Upvotes | 328 |
| Avg. Video Duration | 5 min |
