Two solid rubber balls A and B having masses 200 and 400 g respectively are moving in opposite directions with velocity of A equal to 0.3 m/s. After collision the two balls come to rest, then find the velocity of B.

Two solid rubber balls A and B having masses 200 and 400 g respectivel

1.	Two solid rubber balls A and B having masses 200 and 400 g respectively are moving in opposite directions with velocity of A equal to 0.3 m/s. After collision the two balls come to rest, then find the velocity of B.
Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :Initial linear <a href="https://interviewquestions.tuteehub.com/tag/momentum-1100588" style="font-weight:bold;" target="_blank" title="Click to know more about MOMENTUM">MOMENTUM</a> of system `= m _(A) v _(A) = m _(B) v _(B)` <br/> `= 0.2 xx 0.3 +0.4 xx v_(B)` <br/> <a href="https://interviewquestions.tuteehub.com/tag/finally-461212" style="font-weight:bold;" target="_blank" title="Click to know more about FINALLY">FINALLY</a> both <a href="https://interviewquestions.tuteehub.com/tag/balls-891923" style="font-weight:bold;" target="_blank" title="Click to know more about BALLS">BALLS</a> come to rest <br/> `therefore `Final linear momentum = 0 <br/> By the law of conservation of linear momentum `0.2 xx 0.3 +0.4 xx v _(B) =0` <br/> `therefore u _(B)= (0.2xx 0.3)/( 0.4) =- 0.15 m//s`<br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_ELT_AI_PHY_XI_V01_B_C04_SLV_012_S01.png" width="80%"/></body></html>