Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • If a train travelling at  is to be brought to r

If a train travelling at 72 \mathrm{~km} / \mathrm{h} is to be brought to rest in a distance of 200 \mathrm{~m} ,then its retardation should be-

Option: 1

20 \mathrm{~m} / \mathrm{s}^2


Option: 2

4 \mathrm{~m} / \mathrm{s}^2


Option: 3

1 \mathrm{~m} / \mathrm{s}^2


Option: 4

100 \mathrm{~m} / \mathrm{s}^2


Answers (1)

best_answer

Given ,

\begin{aligned} \text { speed }=72 \mathrm{~km} / \mathrm{h} & =72 \times \frac{5}{18} \\ & =20 \mathrm{~m} / \mathrm{s} . \end{aligned}
Use newton's equation of Motion-
v^2=u^2+2 a s
For retardation acceleration will be negative.
\begin{aligned} & (0)^2=(200)^2+2(-a) 200 \\ & 0=400-400 a \end{aligned}
\begin{aligned} 400 & =400 \mathrm{a} \\ a & =1 \mathrm{~m} / \mathrm{s}^2 \end{aligned}

Posted by

Shailly goel

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

Before NEET, CMC Vellore’s unique MBBS admissions tested aptitude along with merit; paper-leak restarts debate
anam-khan

NEET-UG paper leak fallout: Latur admin orders crackdown on illegal coaching classes
anam-khan

Re-NEET in 30 days a ‘massive logistical challenge’, NTA adopts ‘zero trust’ policy: Report

Latest Question