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- Wastewater Story
NCERT Exemplar Solutions Class 7 Science Solutions for Wastewater Story - Exercise in Chapter 18 - Wastewater Story
Prev
Name two alternative arrangements for sewage disposal where there is no sewerage system.
Answer:
(i) Septic tanks (ii) Composting pits
Video transcript
"hey kids welcome to lido q a video
i am vinit your leader tutor bringing
you this question on your screen
a piece of stone is thrown vertically
upwards
it reaches the maximum height in three
seconds
if the acceleration of the stone be 9.8
meter per second square
that is the acceleration due to gravity
directed towards the ground calculate
the initial velocity of the same
with which it is thrown upwards
now the final velocity is equal to
zero meter per second because it comes
to a halt
at the end acceleration due to gravity
is equal to 9.8 meter per second square
and time is equal to
3 seconds
right now we know
v is equal to u plus a t since
acceleration is acceleration due to
gravity here
we'll write it as v equal to u plus gt
that means zero is equal to u plus
nine point eight into three three
right
therefore u is equal to minus 9.8
into 3 that is equal to minus 29.4
meter per second
therefore
initial velocity the negative sign
implies that the
velocity is in the downward direction
in downward
direction isn't that easy guys
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 kids
keep practicing keep learning"
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