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Civil Engineering PE

Category - Transportation

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Which of the following is the approximate average velocity of a vehicle that slows from 18 meters/second (m/s) to 2.4 m/s in 4.0 seconds?

7.8 m/s
9.8 m/s
10.2 m/s
None of the above

Explanation

Answer: C - The approximate average velocity of a vehicle that slows from 18 m/s to 2.4 m/s in 4.0 seconds is 10.2 m/s.

Solution: Average the initial and final velocities

V_ave = (V_i + V_f)/2

Given,

V_i = 18 m/s

V_f = 2.4 m/s

Therefore,

V_ave = (18 + 2.4)/2 = 10.2 m/s

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