(C) Let the distance between home and school be $S$.Time taken to travel from home to school is $t_1 = S / 20$.Time taken to travel from school to hom

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(C) Let the distance between home and school be $S$.Time taken to travel from home to school is $t_1 = S / 20$.Time taken to travel from school to home is $t_2 = S / 40$.Total distance covered = $S + S = 2S$.Total time taken = $t_1 + t_2 = S / 20 + S / 40 = (2S + S) / 40 = 3S / 40$.Average speed = $\text{Total distance} / \text{Total time} = 2S / (3S / 40) = (2S \times 40) / 3S = 80 / 3 = 26.67 \, km \, h^{-1}$.

Class 9 Science MOTION Textbook - MOTION

Difficult

Abdul,while driving to school,computes the average speed for his trip to be $20 \, km \, h^{-1}$. On his return trip along the same route,there is less traffic and the average speed is $40 \, km \, h^{-1}$. What is the average speed (in $km \, h^{-1}$) for Abdul's trip?

A
$20$
B
$44$
C
$26.67$
D
$30$

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$A$ train is travelling at a speed of $90\, km \,h^{-1}$. Brakes are applied so as to produce a uniform acceleration of $-0.5\, m s^{-2}$. Find how far (in $m$) the train will go before it is brought to rest.

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Easy

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Joseph jogs from one end $A$ to the other end $B$ of a straight $300 \, m$ road in $2 \, min$ $30 \, sec$ and then turns around and jogs $100 \, m$ back to point $C$ in another $1 \, min$. What are Joseph's average speeds and velocities in jogging from $A$ to $C$?

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An athlete completes one round of a circular track of diameter $200\, m$ in $40\, s$. What will be the distance covered and the displacement at the end of $2\, min$ $20\, s$?

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Abdul,while driving to school,computes the average speed for his trip to be $20 \, km \, h^{-1}$. On his return trip along the same route,there is less traffic and the average speed is $40 \, km \, h^{-1}$. What is the average speed (in $km \, h^{-1}$) for Abdul's trip?

Similar Questions

$A$ train is travelling at a speed of $90\, km \,h^{-1}$. Brakes are applied so as to produce a uniform acceleration of $-0.5\, m s^{-2}$. Find how far (in $m$) the train will go before it is brought to rest.

What does the path of an object look like when it is in uniform motion?

What does the odometer of an automobile measure?

Joseph jogs from one end $A$ to the other end $B$ of a straight $300 \, m$ road in $2 \, min$ $30 \, sec$ and then turns around and jogs $100 \, m$ back to point $C$ in another $1 \, min$. What are Joseph's average speeds and velocities in jogging from $A$ to $C$?

An athlete completes one round of a circular track of diameter $200\, m$ in $40\, s$. What will be the distance covered and the displacement at the end of $2\, min$ $20\, s$?

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