Essentials of PHYSICS Class IX>Chapter 1 - Motion>Assignment>Q 8

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A body can have zero average velocity but not zero average speed. Justify.

Important Questions on Motion

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Assignment>Q 9

Mention two differences between speed and velocity.

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Practice Problems>Q 1

A train

100 m

long is moving with a velocity of

60 km h^{- 1}

. Find the time it takes to cross the bridge

1 km

long.

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Practice Problems>Q 2

A car covers a distance

x

while moving at

54 km h^{- 1}

in

15

second. The value of

x

is.

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Practice Problems>Q 3

On a

120 km

track, a train travels the just

30 km

at a uniform speed of

30 \frac{km}{h}

. Calculate the speed with which the train should move rest of the track so as to get average speed of

60 \frac{km}{h}

for the entire trip.

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Practice Problems>Q 4

A girl moves with the speed of

6 km h^{- 1}

for

2 h

and with the speed of

4 km h^{- 1}

for the next

3 h

. Find the average speed of the girl and the total distance moved.

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Practice Problems>Q 5

A bus travels at a distance of

120 km

with a speed of

40 km h^{- 1}

and returns with a speed of

30 km h^{- 1}

. Calculate the average speed for the entire Journey.

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Practice Problems>Q 6

Joseph jogs from one end $A$ to the other end $B$ of a straight $300 m$ road in $2$ minutes $50$ seconds and then turns around and jogs $100 m$ back of point $C$ in another minute. What are Joseph's average speeds and velocities in jogging?

(a) from $A$ to $B$ and

(b) from $A$ to $C$

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Practice Problems>Q 7

Rajeev went from Delhi to Chandigarh on his motor bike. The odometer of the bike read

4200 km

at the start of trip and

4460 km

at the end of the trip. If Rajeev took

4 h 20

minutes to complete his trip, find the average speed in

{kmh}^{- 1}

and

{ms}^{- 1}

.