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Motion in a Straight Line
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Speed and Velocity
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Speed and Average Speed
Speed and Average Speed
5 Mins
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Important Questions
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 :
Easy
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>
An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.
Medium
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>
A car travels from A to B at a, speed of
$20kmh_{−1}$
and returns at a speed of
$30kmh_{−1}$
. The average speed of the car for the whole journey is:
Medium
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>
Joseph Jogs from one end
$A$
to the other end
$B$
of a straight
$300m$
road in
$2$
minutes
$30$
seconds and then turns around and jogs
$100m$
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 man walks on a straight road from his home to a market
$2.5km$
away with a speed of
$5kmh_{−1}$
. Finding the market closed, he instantly turns and walks back home with a speed of
$7.5kmh_{−1}$
. What is the
(a) magnitude of average velocity, and
(b) average speed of the man over the interval of time
(i)
$0$
to
$30min$
,
(ii)
$0$
to
$50min$
(iii)
$0$
to
$40min$
?
Hard
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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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>
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
$s_{−2}$
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 covers the first half the distance between two places at 40 km/h another half at 60 km/h, the average speed of car
Medium
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>
A motorcyclist drives from A to B with a uniform speed of
$30kmh_{−1}$
and returns with a speed of
$20kmh_{−1}$
. Find the average speed.
Medium
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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?
Medium
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>