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Average Speed And Uniform Speed (Or Constant Speed)

Assertion (A): A bus started from rest and accelerated uniform

Question

Medium

Solving time: 3 mins

Assertion (A): A bus started from rest and accelerated uniformly and gains a speed of $80 km h^{- 1}$ in one hour, and then, it decelerates uniformly and attains a speed of $60 km h^{- 1}$ in the next hour. Then the average speed of the bus is $70 km h^{- 1}$ .
Reason (R): The average speed of the bus is given by, $\frac{u + v}{2}$ .

Name: Video solution 1: Assertion (A): A bus started from rest and accelerated uniformly and gains a speed of 80 km h−1 in one hour, and then, it decelerates uniformly and attains a speed of 60 km h−1 in the next hour. Then the average speed of the bus is 70 km h−1.Reason (R): The average speed of the bus is given by, 2u+v.
Uploaded: 2023-05-19T09:48:04.000Z
Duration: 3 min
Description: Video solution 1: Assertion (A): A bus started from rest and accelerated uniformly and gains a speed of 80 km h−1 in one hour, and then, it decelerates uniformly and attains a speed of 60 km h−1 in the next hour. Then the average speed of the bus is 70 km h−1.Reason (R): The average speed of the bus is given by, 2u+v.

A

and

R

are true and

R

is the correct explanation of

A

A

and

R

are true, but

R

is not the correct explanation of

A

A

is true but

R

is false.

Both

A

and

R

are false.

Views: 5,417 students

Updated on: May 19, 2023

Found 8 tutors discussing this question

Sebastian Discussed

Assertion (A): A bus started from rest and accelerated uniformly and gains a speed of

80 km h^{- 1}

in one hour, and then, it decelerates uniformly and attains a speed of

60 km h^{- 1}

in the next hour. Then the average speed of the bus is

70 km h^{- 1}

.
Reason (R): The average speed of the bus is given by,

\frac{u + v}{2}

6 mins ago

Discuss this question LIVE

6 mins ago

Text solutionVerified

A vertically projected body moves with a uniform acceleration. As the acceleration is not uniform, average speed cannot be determined as

\frac{u + v}{2}

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Question Text	Assertion (A): A bus started from rest and accelerated uniformly and gains a speed of $80 km h^{- 1}$ in one hour, and then, it decelerates uniformly and attains a speed of $60 km h^{- 1}$ in the next hour. Then the average speed of the bus is $70 km h^{- 1}$ . Reason (R): The average speed of the bus is given by, $\frac{u + v}{2}$ .
Updated On	May 19, 2023
Topic	Motion
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 1
Upvotes	250
Avg. Video Duration	3 min

Text solutionVerified

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