Physics, asked by deepanshi15, 1 year ago

A runner completes one round of a circular path of radius r in 40sec. His displacement after 2 minutes 20 seconds will be

Answers

Answered by Anonymous
36
Radius is r. Circumference is = 2 pi r.

Time is 40 s.

Every 40 seconds he comes back to original position l. So in 140 s he would cover 3 and half circles. Hence

Total distance is 2r pi x 3.5 = 7r pi.

Total displacement will be = 2r since ball will be directly across the diameter .

deepanshi15: How
deepanshi15: But the answer is 2r
deepanshi15: But the answer is 2r
BrainlyPrincess: awesome answer Asif
Chhavikapoor: nice way of answering
Answered by ShuchiRecites
65
\textbf{ Hello Mate! }

The runner complete one round = 40 seconds

Now, he runs for 2 mins 20 s

Convert 2 mins 2 s into seconds =

2 × 60 seconds + 20 s

= 120 s + 20 s => 140 s

Now, rounds taken by the runner = 140 / 40
=> 3.5 rounds.

Now, please see the attachment

Lets think that we started from A

1. Take 3 rounds.
2. You will surely standing on A only.
3. Now take 0.5 round and you will cover half of circle.

Hence, displacement is diameter of circle.

As, radius was r so diameter will be 2r

\boxed{ Answer : 2r }

Have greay future ahead!
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BrainlyPrincess: oh sorry
ShuchiRecites: Its ok sis
BrainlyPrincess: Shuchi sis
Chhavikapoor: nice way of answering
ShuchiRecites: Thanks Chhavikapoor
Chhavikapoor: ..☺
Noah11: great answer mam! :)
aakash1394: wao sachin bro
ShuchiRecites: Thanks Noah and aakash
Noah11: :)
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