Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

A body is dropped from a certain heigh H. If the ratio of distance travelled by it in (n-3)seconds to (n-3)nd secondsecond is 4:3, find H.(g = 10 m/s^2)  
Asked by acv27joy | 12 May, 2018, 08:18: PM
answered-by-expert Expert Answer
Let me say about what I understand about this question.
 
S1 is the distance travelled for (n-3) seconds from a height H after its dropping.
S2 is the distance travelled at (n-3)th second. i.e during the interval of (n-4) second to (n-3) second
Given ratio S1:S2 is 4:3 ; n seconds is the total time travel to cover the distance H.
 
Distance travelled upto (n-3) seconds,  S1 = (1/2)×g×(n-3)2   ......................(1)
speed after (n-4) second is , u = (n-4)×g ....................(2)
Distance travelled from (n-4)th second to (n-3)th second, S2 = u×1+(1/2)g×1×1 = (n-4)×g+(1/2)×g.........(3)
 
S1/S2 = [ (1/2)×g×(n-3)2] / [ (n-4)×g+(1/2)×g ] = 4/3 ........................(4)
 
solving the eqn.(4) for n, we get n=5;
 
Hence distance travelled H = (1/2)×g×5×5 = 125 m [ put g = 10 m/s2 ]
Answered by Thiyagarajan K | 13 May, 2018, 09:48: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Physics
what type of image produced by plane mirror
Asked by agankitgupta938 | 18 Apr, 2024, 04:29: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
how is light made
Asked by infinityupgraded | 13 Apr, 2024, 08:17: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what are the ray diagrams??
Asked by suryamr2019 | 08 Mar, 2024, 04:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Plssss answer..... Assertion: Magnetic field lines never intersect each other. Reason: If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.
Asked by sheetal.kolte | 04 Mar, 2024, 12:38: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what is drawn
question image
Asked by shrilakshmimunoli | 01 Mar, 2024, 01:15: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
write ohm's law for electric circuit. Also write the necessary formula for this .
Asked by khajannirwan | 27 Feb, 2024, 10:20: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
where can i find a video on magnetic field in physics? thanks
Asked by sailakshmi.avinesh | 13 Feb, 2024, 07:03: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
find Req
question image
Asked by sakshikatewa0 | 08 Feb, 2024, 12:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
student observes the above phenomenon in the lab as a white light passes through a prism. Among many other colours, he observed the position of the two colours Red and Violet. What is the phenomenon called? What is the reason for the violet light to bend more than the red light?
Asked by saurabhjd527 | 30 Jan, 2024, 07:55: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Will a current carrying conductor produce an electric field?
Asked by saanviyadla | 24 Jan, 2024, 07:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×