Easy operations but somehow I'm wrong

  • Thread starter fallen186
  • Start date
  • #1
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Homework Statement


Carry out these operations as if they were calculations of experimental results, and express each answer in the correct units and with the correct number of significant figures:
(d) (7.8 m - 0.34 m) / (1.15s + 0.82 s)


Homework Equations


V=d/t


The Attempt at a Solution


(7.8 m - 0.34 m) / (1.15 s + 0.82 s)
(7.46 m) / (1.97 s)
3.79 m/s

It tells me the answer is 0.76 m/s :\. I double checked and this is what they say is the right answer.
 

Answers and Replies

  • #2
mgb_phys
Science Advisor
Homework Helper
7,819
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I think you misunderstood the question, the second number is the uncertainty on the first.
So the question is 7.8m/1.15s and then from the uncertainty in the values you are given decide how many figures you are justified in using in the answer.
 

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