1800-150-456-789
FlagBACK
Flag 9 grade science> A body is dropped from a certain height a...
question mark

A body is dropped from a certain height and takes 6 second to reach the ground.How much time does it take to cover one-ninth the distance starting from top?

Ayush , 6 Years ago
Grade 9
anser 1 Answers
Susmita

Last Activity: 6 Years ago

h=ut+ \frac{1}{2}gt^2
initial speed u=0.
t=6s
acceleration g=9.81 m/s2=10m/s2 approx.
Therefore , height h= \frac{1}{2}*10*6^2=5*36 m
Now one nineth the distance  is 
H=\frac{h}{9}= \frac{1}{9}*5*36=5*4 m=20m
Using the same formula
t= \sqrt[]{2h/g}=\sqrt[]{\frac{2*20}{10}}=2s

Provide a better Answer & Earn Cool Goodies

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Other Related Questions on 9 grade science

question mark
a car travels half distance with the speed of 20m/s and next half distance travel with 30 m/s , the average speed of the car is
9 grade science
1 Answer Available

Last Activity: 2 Years ago

question mark
A hockey ball of mass 200g travelling from west to east at 10m//s is struck by a hockey stick. As a result, the ball gets turned back and now has a speed of 5m//s. If the ball and hockey stick were in contact for 0.2s, Calculate (i) initial and final momentum of the ball (ii) rate of change of momentum of the balll (iii) force exerted by hockey stick on the ball.
9 grade science
1 Answer Available

Last Activity: 3 Years ago

question mark
Which step is not involved in the carbon-cycle ?
9 grade science
1 Answer Available

Last Activity: 3 Years ago

question mark
Draw a neat labelled diagram of a vernier callipers.
9 grade science
1 Answer Available

Last Activity: 3 Years ago

question mark
Why are lead compounds are added to petrol? How is it harmful?
9 grade science
1 Answer Available

Last Activity: 3 Years ago