Fgure 8.26 shows the distance-time graphs of two trains, which start moving simultaneously in the same direction. From the graphs, find:

(i) How much ahead of A is B when the motion starts?

(ii) What is the speed of B?

(iii) When and where will A catch B?

(iv) What is the difference between the speeds of A and B?

Solution

(i) When the motion started, B is ahead of A by distance OP = 100 km
$left parenthesis ii right parenthesis space Speed space of space straight B space equals space QR over PR space equals space fraction numerator 150 minus 100 over denominator 2 minus 0 end fraction space equals space 25 space km divided by straight h. space$

(iii) As it is clear from graphs, A will catch B at point Q, i.e., after 2 hours and at a distance of 150 km.
$left parenthesis iv right parenthesis space space space space Speed space of space straight A space equals space QS over OS space equals space fraction numerator 150 minus 0 over denominator 2 minus 0 end fraction space equals space 75 space km divided by straight h therefore space space space Difference space in space speeds space equals space 75 minus 25 space equals space 50 space km divided by straight h.$

Some More Questions From Matter In Our Surroundings Chapter

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Matter In Our Surroundings

Some More Questions From Matter In Our Surroundings Chapter

For any substance, why does the temperature remain constant during the change of state ?

Suggest a method to liquify atmospheric gases.

Convert the following temperatures to Kelvin scale.

35°C

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)0⁰C
c)100⁰C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.

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NCERT Sample Papers

Entrance Exams Preparation

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For Daily Free Study Material Join wiredfaculty

Matter In Our Surroundings

Some More Questions From Matter In Our Surroundings Chapter

For any substance, why does the temperature remain constant during the change of state ?

Suggest a method to liquify atmospheric gases.

Convert the following temperatures to Kelvin scale.35°C

Give reason for the following observations.Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.We can get the smell of perfume sitting several metres away.

What is the physical state of water ata) 25°C b)00Cc)1000C

What is the physical state of water at0°C

What is the physical state of water at100°C

Give two reasons to justifyWater at room temperature is a liquid.

Give two reasons to justifyAn iron almirah is a solid at room temperature.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Convert the following temperatures to Kelvin scale.

35°C

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)0⁰C
c)100⁰C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.