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Abdul, while driving to school, computes the average speed for

Science

Class 9

NCERT

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Joseph jogs from one end A to the other end B of a straight

300 m

road in 2 minutes 30 seconds and then turns around and jogs

100 m

back to point C in another 1 minute. What are Joseph's average speeds and velocities in jogging (a) from A to B and (b) from A to C?

Abdul, while driving to school, computes the average speed for his trip to be

20

h^{- 1}

. On his return trip along the same route, there is less traffic and the average speed is

30

h^{- 1}

. What is the average speed for Abdul's trip?

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?

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Question

Medium

Solving time: 4 mins

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 $30$ km $h^{- 1}$ . What is the average speed for Abdul's trip?

Views: 7,318 students

Updated on: Feb 14, 2023

Book:

Science (NCERT)

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Abdul, while driving to school, computes the average speed for his trip to be

20

h^{- 1}

. On his return trip along the same route, there is less traffic and the average speed is

30

h^{- 1}

. What is the average speed for Abdul's trip?

6 mins ago

Discuss this question LIVE

6 mins ago

Text solutionVerified

Let us assume that Abdul is travelling

x

kilometer distance while going to school.

Distance = Speed x Time

1)When it's average speed is 20 km/hr

x = v_{1} \times t_{1} = 20 \times t_{1}

2)When it's average speed is 30 km/hr

x = v_{2} \times t_{2} = 30 \times t_{2}

V_{a v er a g e} = \frac{t o t a l d i s t an ce t r a v e ll e d}{t o t a l t im e t ak e n}

V_{a v er a g e} = \frac{x + x}{\frac{x}{v _{1}} + \frac{x}{v _{2}}} = \frac{2 x}{\frac{x}{20} + \frac{x}{30}} = 24 km h^{- 1}

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Practice more questions from Science (NCERT)

Joseph jogs from one end A to the other end B of a straight

300 m

road in 2 minutes 30 seconds and then turns around and jogs

100 m

back to point C in another 1 minute. What are Joseph's average speeds and velocities in jogging (a) from A to B and (b) from A to C?

Abdul, while driving to school, computes the average speed for his trip to be

20

h^{- 1}

. On his return trip along the same route, there is less traffic and the average speed is

30

h^{- 1}

. What is the average speed for Abdul's trip?

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?

View all

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Question Text	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 $30$ km $h^{- 1}$ . What is the average speed for Abdul's trip?
Updated On	Feb 14, 2023
Topic	Motion
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 5
Upvotes	423
Avg. Video Duration	9 min

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 $30$ km $h^{- 1}$ . What is the average speed for Abdul's trip?

Text solutionVerified

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Text solutionVerified

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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 $30$ km $h^{- 1}$ . What is the average speed for Abdul's trip?