Bus slows down uniformly from 21 m/s to 0 m/s in 21 s. How far does it travel before stopping?

1 hour = 3,600 seconds

1 km = 1,000 meters

75 km/hour = (75,000/3,600) m/s =  20-5/6 m/s

The average speed of the bus while it slows down is

                                   (1/2)(20-5/6 + 0) = 10-5/12 m/s .

Traveling at an average of 10-5/12 m/s for 21 seconds,

the bus covers

                         (10-5/12) x (21) =  218.75 meters .

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answer by (AL2006 from )

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