Question

`See \: Attachment. \:`

A car travelling at 110 km/h decelerates for 4.5 seconds to a final velocity of 45 km/h. Calculate the deceleration of the car.

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Answer 1

Final velicity=45km/h=45×5/18=12.5m/s

Initial velocity =110km/h=110×5/18=30.5m/s

Time=4.5s

Deceleration=v-u/t

=(12.5-30.5)/4.5 m/s²

=18/4.5 m/s²

=4m/s²