Question

1) Two balls A(2kg) and B(4kg) moves towards each other and after collision moves backward.If the initial velocity of A and B were 2m/s and 4m/s respectively then what could be thir final velocitys​

Answer 1

From theory we know that if collision is elastic than momentum is interchanged.

Initial momentum of A = 2x2=4p

Initial momentum of B=4x4=16p

Final momentum of A=2x8=16p

Final momentum of B=4x1=4p

hence final velocity of A =8m/s

final velocity of B=1m/s