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physics-rotational dynamics

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Two astronauts, each having a mass of 75.0 kg, are connected by a 10.0 m rope of negligible mass. THey are isolated in space,orbiting their center of mass at speeds of 5.00 m/s. calculate
A)magnitude of the angular momentum of the system by treating astronauts as particles
and B) the rotational energy of the system. by pulling on the rope, the astronauts shorten the distance between them to 5.00m
C)what is the new angular momentum of the system?
D) what are their new speeds?
E) what is the new rotational energy of the system?
F) how much work is done by the astronauts in shortening the rope?

Please someone help me. i know it is a lot of parts. i have been working on it all on my four day weekend. and then i tried it today..and its not working so can someone please help..thanks

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