IIT JEE , AIEEE Forum - Physics , Mechanics

thevyzz

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let m1 , u1,v1 be the mass and intial and final velocity of object 1

let m2, u2,v2 be the mass and intial and final velocity of object 2

initially p = m1*u1 ( initial momentum)

KE = m1 * u1^2 / 2

final momentum = m1v1 + m2v2

but by conservaiton of momentum

m1u1 = m1v1+ m2v2

but since kinetic energy is also conserved

m1 * u1^2 = m1 * v1^2 + m2 * v2 ^2

if the bodies do not follow each other ( ie angle between is not equal to 0) , then the momentum would still be conserved, however the kinetic energy would end up higher than the initial one( since momentum is a vector while KE is a scalar)

kinetic energy will be conserved only when the angle between is 0 , ( if we give the prime preference to conservation of momentum)

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