Questions
Body of mass M is much heavier than the other body of mass m The heavier body with speed v collides with the lighter body which was at rest initially elastically. The speed of lighter body after collision is [AIIMS 2018]
detailed solution
Correct option is A
From law of conservation of momentum, Mv + m × 0 = Mv1 + mv2⇒ M(v-v1) =mv2 …(i)Again, from the conservation of kinetic energy (as collision is of elastic nature), 12Mv2+12m×0=12Mv12+12mv22⇒ Mv2-v12=mv22 …(ii)On solving Eqs. (i) and (ii), we get Mv-v1Mv+v1v-v1=mv2mv22 v2=v+v1Now, solving Eqs. (i) and (iiil, we get v1=(M-m)v(M+m)and v2 = 2Mv(M + m)As, M >>mSo, v1=v and v2=2vHence, velocity of lighter body (m) is 2v.Talk to our academic expert!
Similar Questions
Three particles each of mass m are located at vertices of an equilateral triangle ABC. They start moving with equal speeds each along the meridian of the triangle and collide at its center G. If after collisions A comes to rest and B returns its path along GB, then C
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests