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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
5 mins
Velocity
5 mins
Problem on Average Velocity
5 mins
Velocity
8 mins
Speed and Average Speed
5 mins
REVISE WITH CONCEPTS
Speed
Example
Definitions
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>
Speed-Basic
Example
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>
Speed Records
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>
Introduction to Kinematics
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Speed and Velocity
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QUICK SUMMARY WITH STORIES
Distance and Displacement
3 mins
Speed and its Unit
2 mins
Velocity and Average Velocity
2 mins
Acceleration
2 mins
Basic Introduction of Speed
2 mins
Calculation of Speed and Average Speed
3 mins
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Important Questions
A man walks on a straight road from his home to a market
2
.
5
k
m
away with a speed of
5
k
m
h
−
1
. Finding the market closed, he instantly turns and walks back home with a speed of
7
.
5
k
m
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
m
i
n
,
(ii)
0
to
5
0
m
i
n
(iii)
0
to
4
0
m
i
n
?
Hard
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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 particle moving in a straight line covers half the distance with speed of
3
m
/
s
. The other half of the distance is covered in two equal time interval with speed of
4
.
5
m
/
s
and
7
.
5
m
/
s
respectively. The average speed of the particle during this motion is
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
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>
Joseph Jogs from one end
A
to the other end
B
of a straight
3
0
0
m
road in
2
minutes
3
0
seconds and then turns around and jogs
1
0
0
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
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>
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
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>
A driver of a car travelling at
5
2
km
h
−
1
applies the brakes and accelerates uniformly in the opposite direction. The car stops in
5
s. Another driver going at
3
km
h
−
1
in another car applies his brakes slowly and stops in
1
0
s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?
Medium
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>
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 moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of the distance at speed v. If the average speed is 48 km/h, then the value of v is-
Medium
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>
A car travels half of the distance with constant velocity 40 km/h and another half with a constant velocity of 60 km/h along a straight line. The average velocity of the car is
Medium
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>