Physics
Class 9
Lakhmir Singh
1
Chapter 1: Motion
117 questions
2
Chapter 2: Force and Laws of Motion
114 questions
3
Chapter 3: Gravitation
157 questions
4
Chapter 4: Work and Energy
128 questions
Q1
Question 75:
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
Q2
Question 77:
When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?
Q3
Question 78:
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
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Chapter 5: Sound
162 questions
Question
Question 77: When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?
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Text solution
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Answer:
When a ball is thrown vertically upwards, its velocity goes on decreasing and hence, its kinetic energy also keeps on decreasing. As the ball is thrown vertically upwards, its height continuously increases to a certain point and hence, its potential energy increases continuously and reaches its maximum value when the ball reaches the maximum height.
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Practice more questions from Physics (Lakhmir Singh)
Q1
Question 75:
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
Q2
Question 77:
When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?
Q3
Question 78:
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
View allPractice questions from Physics (Lakhmir Singh)
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Practice more questions from Work and Energy
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(a) A stone kept on roof-top
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Question 2
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(a) by the stretched rubber strings of a catapult?
(b) by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
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| Question Text | Question 77:
When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero? |
| Updated On | Feb 24, 2023 |
| Topic | Work and Energy |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 239 |
| Avg. Video Duration | 7 min |
