Question

A ball is moving with a velocity of 10m\s. Suddenly it breaks into two equal parts.What will be the speed of centre of mass of the system after explosion? ​

Answer 1

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momentum conservation

7v=3u

KE=1680

7v^2/2 + 3u ^2/2

=1680

v=12m/s

u=28

magnitude of relative velocity is V=12+28=40, as they move in opposite direction.