Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 1 - Motion
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a) Define speed. What is the SI unit of speed?
b) What is meant by:
i) average speed
ii) uniform speed?
Answer:
a) Speed is defined as the distance travelled by the body in unit time. m/s is the SI unit of speed.
b) i) Average speed is the sum total of the distance travelled by a body divided by the total time taken to cover that distance.
Average speed = (total distance travelled)/(total time taken)
ii) Uniform speed refers to the constant speed of a moving body in which the body covers an equal distance in equal time intervals.
Video transcript
"hi kids welcome to lito q a video
i am vineeth your little tutor excited
to bring this question
to you define speed what is the si unit
of speed
now how would you define speed
speed can be defined as
the distance
travel
in a given period
sorry in a
unit time
yeah and meter per second is the
si unit of speed
we all know this right great
now what is average speed
any idea guys what is average of
anything
the sum total divided by the
number of events
like that right so average
speed will be
total distance
traveled
yeah in
a given
time interval
yeah an average speed is given by
total distance by
total time isn't that easy
it is guys right now
you cannot tell me it's not easy
what is uniform speed we all know what
uniform speed is
uniform speed is
speed
at which
like constant speed
yeah no fluctuation in speed that means
the acceleration is zero
at which distances
covered in
equal time interval
are equal right
so this was easy guys right if you still
have a doubt
please leave a comment below do like the
video and subscribe to our channel
i'll see you in our next video until
then
bye guys keep learning"
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