A vehicle moving at 54 kmph speed was stopped by applying new technology brake and the length of skid mark was 20 m. If the average skid resistance of the pavement surface is known to be 0.6, then the brake efficiency of the vehicle is %.

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.