13. A vehicle travels the transition curve of radius 150 m in duration 15 s at a design speed of 80 km/h. The rate of change of centrifugal acceleration is (a) 0.62 m/s 3 (b) 0.49 m/s 3 (d) 0.17 m/s 3 (c) 0.22 m/s 3

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.