Nirabhra
from
bluebells international, New Delhi
Subject :Sam Class : Sample
The given diagram shows a series of images of a moving ball captured by a camera.
The ball was moving at a constant velocity and the images were taken at a constant rate of 10 per second. What is the speed of the ball?
A30 ms-1
B20 ms-1
C45 ms-1
D15 ms-1
i am unable to understand how
Ans 1:
Edit Post
kashvi
from
Amity, noida
Class : Class 7
Given ..
(1) time taken to take 10 shots=1 sec
==> time taken to take one shot= 1/10 sec
(2) Distance travelled by ball while camera took 6 shots =15 meter
We know , speed= distance/time
Distance=15m
Time= Not known... lets find out the time to take six shots
Fist shot was taken after = 0sec (as first short was taken at beginning)
Second shot taken after = 1*(1/10) = 1/10 seconds
Third short taken after = 2*(1/10) =2/10 seconds
Similarly .. sixth shot taken after = 5*(1/10) =5/10
Now..
speed = distance/time = 15 / (5/10) = 30 m/second
Hope, it helps.
Ans 2:
Edit Post
Ans 3:
Edit Post
Chinmay Pathak
from
Navy Children School, Ernakulam
Class : Class 7
Time taken to shoot 10 images is 1 secTime taken to shoot 6 images is 0.6 sec.Assuming that the full revolution of ball is not considered thenSpeed = distance/time= 15/0.6= 25m/sIf we consider that in five shots the ball has exactly done two revolution then we have to also consider that it has travelled only 12.5 MTS.Then the speed is 12.5/0.5=25 m/s
Ans 4:
Edit Post
Kashish Kathuria
from
Delhi Public School, Bangalore
Class : Class 9
kasha and tamana thanks for explanation
Ans 6:
Edit Post
niketh
from
dps east, bangalore
Class : Class 6
thank you answer 11 was very clear and understandable
Ans 8:
Edit Post
Ans 10:
Edit Post
Ans 11:
Edit Post
tamanna de
from
K.V.Kailashahar, kailashahar
Class : Class 7
time taken to shoot 10 images=1 second.time taken to shoot 5 images=5/10=1/2seconds.speed=distance/time=15divided by 1/2=15*2=30m/s
Ans 12:
Edit Post
Ans 13:
Edit Post
Aditya
from
Bvb vidyashram, Jaipur
Class : Class 8
thanks kashvi I now really understand how to solve these type of questions . Very good explanation.
Ans 14:
Edit Post
RAHUL SINHA
from
D.A.V Public Koyla Nagar Dhanbad, dhanbad
Class : Class 7
Speed=distance /time
But the answer is 30 m/s^-1
Ans 15:
Edit Post
Ashwath
from
Green Park Senior Secondary School , Namakkal
Class : Class 10
How to solve this question
Ans 16:
Edit Post
Ans 17:
Edit Post
Pulkit Gupta
from
Maxfort School, New Delhi
Class : Class 7
nice explanation from kashvi and tamanna de