Answer this question fast please

A. Strain

Explanation:

(no explanation)

Question:

Which of the following is the dimensionless variable physical quantity?

a) Strain

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with 5 seconds, no, but over time if the police car stays at 65m/s ad the speeding car stays at 60, then obviously yes, but the answer to your question would be, no.

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d) physical means can be used to separate the components of air.