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A bus decreases its speed from 72 kmph to 60 kmph in 5 s. Find the acceleration of the bus. |
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Answer» 0.66m/s² is the required acceleration Explanation:According to the QUESTIONIT is given that ,Initial velocity ,u = 72km/hFinal velocity ,v = 60km/hTime taken,t = 5swe need to calculate the acceleration of the bus. Firstly we change the unit here Initial velocity ,u = 72×5/18 Initial velocity ,u = 4×5 Initial velocity ,u = 20m/sFinal velocity,v = 60×5/18Final velocity ,v = 16.66m/sas we KNOW that acceleration is defined as the RATE of change in velocity. a = v-u/twhere,a denote accelerationv denote final velocityu denote initial velocityt denote time takenSubstitute the value we get➻ a = 16.66-20/5➻ a = -3.34/5➻ a = -0.66m/s²here NEGATIVE sign show RETARDATION Hence, the acceleration of the car is 0.66m/s². |
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