Why is it often not possible to establish a temporal relationship between exposure and disease with a cross sectional study?

 The correct answer is : Because the temporal relationship between the onset of the disease and the exposure cannot be established, then cross-sectional studies cannot assess the cause-effect relationship.

Explanation:  The cross-sectional study is an observational study that evaluates exposure and outcome at a given time in a population sample.

a. formula: f=ma or f/m=a

10,000n/1,267kg≈7.9m/

b. formula: a= and s=d/t

speed= 394.6/15

s=26.3m/s

a=

a=1.75m/

c. 7.9-1.75=difference of 6.15m/

d. the force that most likely caused this difference is friction forces

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