Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 1 - Motion
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a) Define velocity. What is the SI unit of velocity?
b) What is the difference between speed and velocity?
c) Convert speed of 54 km/h into m/s.
Answer:
a) Velocity is defined as the distance travelled by the body in unit time in a given direction. The SI unit of velocity is m/s.
b) The difference between speed and velocity is:
i) Speed is a scalar quantity while velocity is a vector quantity.
ii) Speed is always positive while velocity can be either positive or negative.
iii) Speed is defined as the distance travelled in unit time while velocity is the distance travelled in unit time in a particular direction.
c) Speed = 54 km/h = (54)(1000/3600) = 15 m/s
Video transcript
"hey guys how are you i hope you're good
i am vineet your lido tutor welcoming
you to
little q a video i am excited to bring
you this question on your screen
define velocity what is the si unit of
velocity
then we are going to say see what is the
difference between speed and velocity
then we are going to convert speed of 15
kilometer per hour
into meter per second now let us look at
part a
velocity
is the distance
covered by
a moving
object
per unit time
oh wait a minute this sounds like the
definition of speed so what is the
difference
the difference is in a
given direction
right and the si unit
is meter per second
okay now let us look at the
part b right
and let us look at the differences
between velocity and speed
so here we go
so we have speed and
velocity speed is a scalar quantity
velocity is a vector quantity
and can be
negative this is
always positive
right number two
speed doesn't
have direction
velocity
has direction so these are the
differences now let us look at
number three
or c
c is 54 kilometer
per hour can also be written as 54
kilometer
by one hour so this is equal to
when we convert this into meter we get
54 000 because we multiply by thousand
meters by three thousand
six hundred seconds
so simplifying this we get
so six six are 36
6 90 3 2
30 to 1 15.
we get 15 meter per second so that was
easy isn't it guys
right do leave a comment if you still
have a doubt
and do like the video and subscribe to
our channel
i'll see you in our next video until
then
bye guys keep learning keep flourishing"
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