CBSE Class 12-science Answered
Hi
Asked by jain.pradeep | 28 Apr, 2019, 05:16: PM
Expert Answer
Let ball-1 moves with velocity ( k1 i ) and ball-2 moves with velocity ( -k2 j )
Total initial momentum = m1( k1 i ) - m2( k2 j ) ......................(1)
It is given that, ball-2 moves in positive-x direction after elastic collision, hence let us assme its velocity after collision as ( k3 i )
let ball-1 moves with velocity v after collision.
Total final momenum = m1v + m2 ( k3 i ) ..................... (2)
By conservation of momentum, we equate both (1) and (2) and simplify to get v = [ k1 - (m2 / m1) k3] i - (m2/m1)( k2 j )
since m1 > m2 , we have [ k1 - (m2 / m1) k3] > 0 .
Hence after collision, velocity of ball-1 has positive x-component and negative y-component
Answered by Thiyagarajan K | 28 Apr, 2019, 06:13: PM
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