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When a particle suffers an oblique elastic collision with another particle of equal mass and initially at rest, the two particles would move in mutually perpendicular directions after collision, explain.

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A Retired Physics Teacher for NEET JEE, Board

Let u = initial velocity of the first particle V1, V2 ard the velocities of first and second particle respectively θ1 & θ2 are tbe angles made by the first & second particle respectively with the original direction of U Let u = initial velocity of the first particle V1, V2 ard...
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Let u = initial velocity of the first particle

V1, V2 ard the velocities of first  and second particle respectively

θ1 & θ2 are tbe angles made by the first &  second particle respectively with the original direction of  U

Let u = initial velocity of the first particle

V1, V2 ard the velocities of first  and second particle respectively

 

Equting conservation of momentum in the direction of initial direction of U, &  perpendicular to it, one get,

mU + 0  = m V1 cos θ1+ m cosθ2............. i

0 + 0  =   m V1 sinθ1 +  m V2 sinθ2.............ii

 

For elastic collision kinetic energy is also conserved. 

Equating i initial &  final kinetic energener, 

(1/2)mu2  + 0  = (1/2) mV12  + (1/2) m V22 .. Iii

 

&  adding eqn. i,   ii,  

we get 

U2  = V12    +   V22   + 2 V1 V2  cos  (  θ1  +    θ2   ) 

This equation will  be identical to eqn. iii,  only when  (   θ1   +  θ2    )  = 90 degree. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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