physics significant figures!! urgent.

[foruma]

If I need to write an answer to a question to 2 significant figures, then i round off the value to two s.f alright.

Then, If I need to use the same answer again later, do I use the 2 s.f one or a more precise one that i obtained by calculation. please answer urgently. need to go to the center in half an hour.

 

[arerule]

well...in the mark scheme it will accept the values that u round off from previous question n use it in the next question...thats from what i analyse from past year papers!!