Since the LMS is down, and all of you want the answers so desperately...haha, Ngai Thai has passed me the answers for me to put it for download here.
these are for PHYSICS WORKBOOK

Worksheet 2C
Worksheet 3A
Worksheet 3B
Worksheet 3C
Worksheet 4A
Worksheet 4B
Worksheet 4C
Worksheet 5A
Worksheet 5B

Its all in doc. format. the file size is quite huge though, aprox 3-4mb.