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A stone is dropped at t=0. A second ston...

A stone is dropped at `t=0`. A second stone, will twice the mass of the first, is dropped from the same point at `t=100ms`.
(a) How far below the release point is the centre of mass of the two stones at `t=300ms`?(Neither stone has yet reached at groung).
(b) How fast is the centre of the mass of the two-stone system moving at that time?

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