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# Gcse maths the lower bounds watch

1. E=mc^2 c=3.0X10^8 (2 s.f), m= 2.4 (2 s.f)
Calculate the lower bound of E. Calculate the upper bound of E.
2. (Original post by JJIANG)
E=mc^2 c=3.0X10^8 (2 s.f), m= 2.4 (2 s.f)
Calculate the lower bound of E. Calculate the upper bound of E.
What have you tried?
3. ngl thought this was some petition to lower grade boundaries
4. (Original post by surina16)
ngl thought this was some petition to lower grade boundaries
Same!
5. (Original post by RDKGames)
What have you tried?
the answer ：the lower bound 2.05X10^17,the upper bound 2.28X10^17，but i can't work out
6. (Original post by surina16)
ngl thought this was some petition to lower grade boundaries
Loooooool

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7. (Original post by JJIANG)
the answer ：the lower bound 2.05X10^17,the upper bound 2.28X10^17，but i can't work out
Yeah but show your working towards your incorrect answer. What have YOU tried?
8. (Original post by RDKGames)
Yeah but show your working towards your incorrect answer. What have YOU tried?
Yeah，i work out now ，c=2.95X10^8
9. (Original post by JJIANG)
Yeah，i work out now ，c=2.95X10^8
Yeah that would be the lower bound of the speed of light, you also need the lower bound of the mass to go with it.
10. (Original post by RDKGames)
Yeah but show your working towards your incorrect answer. What have YOU tried?
c=2.5X10^8 is my wrong answer

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