Question

PHYSICS
-
VII CLASS-2020
PHYS
Matrix
2 The velocity of a body is 108 km/h. Its velocity in m/s is.....
a) 10
b) 20
c) 40
d) 30
The straight line distance from Mumbai to Delhi is 1200km. An aircraft flies from 17.
Delhi to Mumbai in 2.5 hours. Find the velocity of the aircraft.
a) 300km/h b) 480km/h
c) 360km/h
i)
d) none
ji
ii​

Answer 1

QuestionS :

1)The velocity of a body is 108 km/h. Its velocity in m/s is.....

a) 10

b) 20

c) 40

d) 30

2) The straight line distance from Mumbai to Delhi is 1200km. An aircraft flies from Delhi to Mumbai in 2.5 hours. Find the velocity of the aircraft.

a) 300km/h

b) 480km/h

c) 360km/h

d) none

___________________________

SolutioN :

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \underbrace {\sf{First \: Question}}$

• Velocity of body (V) = 108 km/h

We've to convert velocity into m/s. So, multiply it by 5/18

$\implies \rm{v \: = \: 108 \: kmh^{-1}}$

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$\implies \rm{v \: = \: 108 \: \times \dfrac{5}{18} \: ms^{-1}}$

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$\implies \rm{v \: = \: 30 \: ms^{-1}}$

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$\: \: \: \: \: \: \: \: \: \: \: \: \: \underbrace {\sf{Second \: Question}}$

• Distance Between Mumbai and Delhi = 1200 km
• Time taken to reach Mumbai from Delhi = 2.5 hours

Use Formula for velocity

$\implies \boxed{\rm{Velocity = \dfrac{Displacement}{Time}}}$

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$\implies \rm{Velocity = \dfrac{1200}{2.5}}$

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$\implies \rm{Velocity = \dfrac{12000}{25}}$

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$\implies \rm{Velocity \: = \: 480 \: kmh^{-1}}$

Answer 2

1) 108 km / hr into m/s

= 108 × 1000m / 3600 s

=30m/s

2) displacement = 1200km

time = 2.5 hrs

velocity = 1200km/2.5hr

= 480km/hr

= 133.34 m/s

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