C-16-Q042mediumsingle_mcq

A $20$ m ladder stands vertically against a wall. If the upper end descends $4$ m, the lower end moves further by —

a $4$ m
b $6$ m
c $8$ m
d $12$ m

ব্যাখ্যা

Vertically the top is at $20$ m; after descending it is at $16$ m, so the foot is $\sqrt{20^2-16^2}=\sqrt{144}=12$ m from the wall. Since it started at the wall ( $0$ m), it moves $12$ m.

এই অধ্যায়ের আরও প্রশ্ন

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Chapter 16: Mensuration — সব প্রশ্ন দেখুন (210টি) →

A 202020 m ladder stands vertically against a wall. If the upper end descends 444 m, the lower end moves further by —

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

A 202020 m ladder stands vertically against a wall. If the upper end descends 444 m, the lower end moves further by —

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

A $20$ m ladder stands vertically against a wall. If the upper end descends $4$ m, the lower end moves further by —

A $20$ m ladder stands vertically against a wall. If the upper end descends $4$ m, the lower end moves further by —