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?
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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.
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