Physics
Class 9
Lakhmir Singh
1
Chapter 1: Motion
117 questions
Q1
Question 54:
What can you say about the motion of a body if :
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
Q2
Question 60:
The graph given alongside shows how the speed of a car changes with time :
Figure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
Figure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
Q3
Question 61:
Three speed-time graphs are given below :
Figure
Which graph represents the case of :
(i) a cricket ball thrown vertically upwards and returning to the hands of the thrower?
(ii) a trolley decelerating to a constant speed and then accelerating uniformly?
View all questionFigure
Which graph represents the case of :
(i) a cricket ball thrown vertically upwards and returning to the hands of the thrower?
(ii) a trolley decelerating to a constant speed and then accelerating uniformly?
2
Chapter 2: Force and Laws of Motion
114 questions
3
Chapter 3: Gravitation
157 questions
4
Chapter 4: Work and Energy
128 questions
5
Chapter 5: Sound
162 questions
Question
Question 60:
The graph given alongside shows how the speed of a car changes with time :
Figure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
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Text solution
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Answer:
(i) Initial speed of the car is 10 km/h
(ii) Maximum speed attained by the car is 35km/h
(iii) BC represents zero acceleration.
(iv) CD represents varying retardation.
(v) Distance travelled is given by the area enclosed within the curve. So,
Distance travelled = Area or trapezium + Area of rectangle
So distance travelled,
= (1/2)(8+5)(25) + (8)(10)
= 242.5 km
(ii) Maximum speed attained by the car is 35km/h
(iii) BC represents zero acceleration.
(iv) CD represents varying retardation.
(v) Distance travelled is given by the area enclosed within the curve. So,
Distance travelled = Area or trapezium + Area of rectangle
So distance travelled,
= (1/2)(8+5)(25) + (8)(10)
= 242.5 km
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Practice more questions from Physics (Lakhmir Singh)
Q1
Question 54:
What can you say about the motion of a body if :
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
(a) its displacement-time graph is a straight line?
(b) its velocity-time graph is a straight line?
Q2
Question 60:
The graph given alongside shows how the speed of a car changes with time :
Figure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
Figure
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
Q3
Question 61:
Three speed-time graphs are given below :
Figure
Which graph represents the case of :
(i) a cricket ball thrown vertically upwards and returning to the hands of the thrower?
(ii) a trolley decelerating to a constant speed and then accelerating uniformly?
View allFigure
Which graph represents the case of :
(i) a cricket ball thrown vertically upwards and returning to the hands of the thrower?
(ii) a trolley decelerating to a constant speed and then accelerating uniformly?
Practice questions from Physics (Lakhmir Singh)
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Figure
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(b) car B is the slowest
(c) car D is faster than the car C
(d) car C is the slowest
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| Question Text | Question 60:
The graph given alongside shows how the speed of a car changes with time : Figure (i) What is the initial speed of the car? (ii) What is the maximum speed attained by the car? (iii) Which part of the graph shows zero acceleration (iv) Which part of the graph shows varying retardation? (v) Find the distance travelled in first 8 hours. |
| Updated On | Feb 22, 2023 |
| Topic | Motion |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 163 |
| Avg. Video Duration | 4 min |
