Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • A body of mass collides head on elastically with a stationary body of mass <img alt="3 \m

A body of mass 1 \mathrm{~kg} collides head on elastically with a stationary body of mass 3 \mathrm{~kg}. After collision, the smaller body reverses its direction of motion and moves with a speed of 2 \mathrm{~m} / \mathrm{s}. The initial speed of the smaller body before collision is __________ \mathrm{ms}^{-1}

Option: 1

4


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\begin{aligned} & \mathrm{p}_{\mathrm{i}}=\mathrm{p}_{\mathrm{f}} \\ & \mathrm{u}_1+\mathrm{o}=-1 \times 2+3 \mathrm{v}_2 \\ & \mathrm{u}_1=3 \mathrm{v}_2-2 \, \, \, \, ...(i)\\ & \mathrm{e}=1=\frac{\mathrm{v}_2-(-2)}{\mathrm{u}_1-0} \\ & \mathrm{v}_2=\mathrm{u}_1-2 \, \, \, ...(2)\\ & \mathrm{u}_1=3\left(\mathrm{u}_1-2\right)-2 \\ & 2 \mathrm{u}_1=8, \mathrm{u}_1=4 \end{aligned}

Posted by

shivangi.shekhar

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2025: 11 from Kota coaching centres among 24 students with 100 percentile
anam-khan

Low JEE Main rank? Explore alternative paths for engineering admission
anam-khan

Gender-gap in JEE Main 2025: Female participation remains around 31%, overall pool drops by 7.09%

Latest Question