Question

4. A bus that is travelling at the rate of 90 km/h slows down to 54 km/h over a distance of
20 m. Calculate the acceleration produced and the time for which the brakes are applied.

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Answer 1

Acceleration of the bus

$= \frac{54m {s}^{ - 1} - 90m {s}^{ - 1} }{20 \: min} \\ = \frac{15m {s}^{ - 1} - 25m {s}^{ - 1} }{1200s} \\ = \frac{ - 10m {s}^{ - 1} }{1200s} \\ = \frac{1}{120} m {s}^{ - 2}$

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