Motion

A driver of a car travelling at 52km h^{-1} applies the brakes

Science

Class 9

NCERT

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A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of

3.0 m / s^{2}

for

8.0

s. How far does the boat travel during this time?

A driver of a car travelling at

52

h^{- 1}

applies the brakes and accelerates uniformly in the opposite direction. The car stops in

5

s. Another driver going at

3

h^{- 1}

in another car applies his brakes slowly and stops in

10

s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?

Fig shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:

(a)

Which of the three is travelling the fastest?

(b)

Are all three ever at the same point on the road?

(c)

How far has C travelled when B passes A?

(d)

How far has B travelled by the time it passes C?

View all question

Chapter 9: Force and Laws of Motion

29 questions

Chapter 10: Work and Energy

23 questions

Chapter 11: Sound

25 questions

Chapter 12: Why do We Fall Ill?

6 questions

Chapter 13: Natural Resourses

6 questions

Chapter 14: Improvement in Food Resources

Chapter 15: Gravitation

29 questions

Question

Hard

Solving time: 4 mins

A driver of a car travelling at $52$ km $h^{- 1}$ applies the brakes and accelerates uniformly in the opposite direction. The car stops in $5$ s. Another driver going at $3$ km $h^{- 1}$ in another car applies his brakes slowly and stops in $10$ s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?

Name: Video answer for A driver of a car travelling at 52km h−1 applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5s. Another driver going at 3km h−1 in another car applies his brakes slowly and stops in 10s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied? - Science
Uploaded: 2023-10-06T00:59:34.000Z
Duration: 16 min
Description: [Solved] A driver of a car travelling at 52km h−1 applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5s. Another driver going at 3km h−1 in another car applies his brakes slowly and stops in 10s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied? - Science

Views: 6,769 students

Updated on: Oct 6, 2023

Book:

Science (NCERT)

Text solutionVerified

(A) : Initial speed of the car A

u = 52

km h^{- 1} = 52 \times \frac{5}{18} = 14.44

m s^{- 1}

v = 0

t = 5

With the help of these initial and final points for both the cases, we can plot the graph of speed vs time.

Area under the speed-time graph gives the distance covered.

u = 3

km h^{- 1} = 3 \times \frac{5}{18} = 0.83

Thus car A travels more distance than B.

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Charlotte Discussed

A driver of a car travelling at

52

h^{- 1}

applies the brakes and accelerates uniformly in the opposite direction. The car stops in

5

s. Another driver going at

3

h^{- 1}

in another car applies his brakes slowly and stops in

10

s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?

12 mins ago

Discuss this question LIVE

12 mins ago

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Practice more questions from Science (NCERT)

A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of

3.0 m / s^{2}

for

8.0

s. How far does the boat travel during this time?

A driver of a car travelling at

52

h^{- 1}

applies the brakes and accelerates uniformly in the opposite direction. The car stops in

5

s. Another driver going at

3

h^{- 1}

in another car applies his brakes slowly and stops in

10

s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?

Fig shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:

(a)

Which of the three is travelling the fastest?

(b)

Are all three ever at the same point on the road?

(c)

How far has C travelled when B passes A?

(d)

How far has B travelled by the time it passes C?

View all

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Question Text	A driver of a car travelling at $52$ km $h^{- 1}$ applies the brakes and accelerates uniformly in the opposite direction. The car stops in $5$ s. Another driver going at $3$ km $h^{- 1}$ in another car applies his brakes slowly and stops in $10$ s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?
Updated On	Oct 6, 2023
Topic	Motion
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 2
Upvotes	235
Avg. Video Duration	15 min

Text solutionVerified

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