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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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Uniform and Non-Uniform Motion
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REVISE WITH CONCEPTS
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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
.
5
Â
k
m
 away with a speed of
5
Â
k
m
Â
h
−
1
. Finding the market closed, he instantly turns and walks back home with a speed of
7
.
5
Â
k
m
Â
h
−
1
. What is the
(a) magnitude of average velocity, and
(b) average speed of the man over the interval of time
(i)
0
 to
3
0
Â
m
i
n
,
(ii)
0
 to
5
0
Â
m
i
n
Â
(iii)
0
 to
4
0
Â
m
i
n
?Â
Hard
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>
Joseph Jogs from one end
A
 to the other end
B
 of a straight
3
0
0
Â
m
 road in
2
 minutes
3
0
 seconds and then turns around and jogs
1
0
0
Â
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
?
Medium
View solution
>
A particle moving in a straight line covers half the distance with speed of
3
Â
m
/
s
. The other half of the distance is covered in two equal time interval with speed of
4
.
5
Â
m
/
s
and
7
.
5
Â
m
/
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 +
b
t
2
, where a = 8.5 m and b = 2.5 m
s
−
2
and t is measured in seconds. The average velocity of the object between t = 2 s and t = 4 s is
Medium
View solution
>
A car travels from A to B at a, speed of
2
0
k
m
h
−
1
and returns at a speed of
3
0
k
m
h
−
1
. The average speed of the car for the whole journey is:
Medium
View solution
>
Abdul, while driving to school, computes the average speed for his trip to be
2
0
km
h
−
1
. On his return trip along the same route, there is less traffic and the average speed is
3
0
km
h
−
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
3
0
Â
k
m
Â
h
−
1
and returns with a speed of
2
0
Â
k
m
Â
h
−
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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>