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Class 11
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Physics
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Motion in a Straight Line
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Speed and Velocity
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Speed
Speed
8 Mins
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QUICK SUMMARY WITH STORIES
Distance and Displacement
3 mins read
Speed and its Unit
2 mins read
Velocity and Average Velocity
2 mins read
Acceleration
2 mins read
Basic Introduction of Speed
2 mins read
Calculation of Speed and Average Speed
3 mins read
Important Questions
A man walks on a straight road from his home to a market
$2.5Âkm$
Â away with a speed of
$5ÂkmÂh_{âˆ’1}$
. Finding the market closed, he instantly turns and walks back home with a speed of
$7.5ÂkmÂh_{âˆ’1}$
. What is the
(a) magnitude of average velocity, and
(b) average speed of the man over the interval of time
(i)
$0$
Â to
$30Âmin$
,
(ii)
$0$
Â to
$50Âmin$
Â
(iii)
$0$
Â to
$40Âmin$
?Â
Hard
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>
Joseph Jogs from one end
$A$
Â to the other end
$B$
Â of a straight
$300Âm$
Â road in
$2$
Â minutes
$30$
Â seconds and then turns around and jogs
$100Âm$
Â back to point
$C$
Â in another
$1$
Â minute. What are Joseph's average speeds and velocities in jogging (a) from
$A$
Â to
$B$
Â and (b) from
$A$
Â to
$C$
?
Medium
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>
A particle moving in a straight line covers half the distance with speed of
$3Âm/s$
. The other half of the distance is covered in two equal time interval with speed of
$4.5Âm/s$
and
$7.5Âm/s$
respectively. The average speed of the particle during this motion isÂ
Medium
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>
The position of an object moving along x-axis is given by x = a +
$bt_{2}$
, where a = 8.5 m and b = 2.5 m
$s_{âˆ’2}$
and t is measured in seconds. The average velocity of the object between t = 2 s and t = 4 s is
Medium
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>
A car travels from A to B at a, speed of
$20kmh_{âˆ’1}$
and returns at a speed of
$30kmh_{âˆ’1}$
. The average speed ofÂ the car for the whole journey is:
Medium
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>
Abdul, while driving to school, computes the average speed for his trip to be
$20$
km
$h_{âˆ’1}$
. On his return trip along the same route, there is less traffic and the average speed is
$30$
km
$h_{âˆ’1}$
. What is the average speed for Abdul's trip?
Medium
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>
A car moving on a straight road covers one third of a certain distance with 20 Km/h and the rest with 60 Km/h. The average speed is :
Medium
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>
A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is :Â
Easy
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>
A motorcyclist drives from A to B with a uniform speed of
$30ÂkmÂh_{âˆ’1}$
and returns with a speed of
$20ÂkmÂh_{âˆ’1}$
. Find the average speed.
Medium
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>
A car travels the first one third of a certain distance with a speed of 10 km/hr, the next one third with a speed of 20 km/hr and the last one third distance with a speed of 60 km/hr The average speed of the car for the whole journey is
Medium
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>