Request a call back

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

CBSE Class 10 Answered

plz explain i cant get it A ladder has rungs 25 cm apart. (see Fig. 5.7). The rungs decrease uniformly in length from 45 cm at the bottom to 25 cm at the top. If the top and the bottom rungs are 1 2 2 m apart, what is the length of the wood required for the rungs? [Hint : Number of rungs = 250 25 ]
Asked by Diya | 23 Feb, 2018, 04:52: PM
answered-by-expert Expert Answer
begin mathsize 16px style the space top space and space bottom space rungs space should space be space 250 straight m space apart space
instead space of space 122 straight m space please space check space other space wise space hint space will space not space be space valid
so space now space rungs space are space 25 space mts space apart
so space number space of space rungs
straight n equals 250 over 25 equals 10
straight a equals 25
last space equals 45
it space is space in space ap space...... uniform space decrease
total space length space means space sum space of space AP
straight S subscript straight n equals 10 over 2 open parentheses 25 plus 45 close parentheses...... straight S subscript straight n equals straight n over 2 open parentheses straight a plus straight l close parentheses
solve end stylebegin mathsize 16px style the space top space and space bottom space rungs space should space be space 250 straight m space apart space
instead space of space 122 straight m space please space check space other space wise space hint space will space not space be space valid
so space now space rungs space are space 25 space mts space apart
so space number space of space rungs
straight n equals 250 over 25 equals 10
straight a equals 25
last space equals 45
it space is space in space ap space...... uniform space decrease
total space length space means space sum space of space AP
straight S subscript straight n equals 10 over 2 open parentheses 25 plus 45 close parentheses...... straight S subscript straight n equals straight n over 2 open parentheses straight a plus straight l close parentheses
solve end style
Answered by Arun | 23 Feb, 2018, 05:40: PM
CBSE 10 - Maths
Asked by deepikaselvam2009 | 20 Feb, 2024, 08:57: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by mchenchuramaiah2 | 20 Feb, 2024, 07:53: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by afiyamallick12 | 18 Feb, 2024, 10:36: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by apekshab05918 | 15 Feb, 2024, 11:29: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by rajk7371198 | 09 Feb, 2024, 11:55: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by neethuchandrika99 | 07 Feb, 2024, 09:43: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by siyatalkar | 07 Feb, 2024, 09:18: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by lawrencelawrence099 | 04 Feb, 2024, 12:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×