Question

" alt="See \: Attachment. \: " align="absmiddle" class="latex-formula">
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.

​

Answer 1

So acceleration = (final velocity - initial velocity)/time

So (fv-iv)/t=a

(45-110)/4.5

Gives you (-130/9)km/h^2

You may have to convert the SI units so just follow my steps and change what must be changed

Answer 2

Answer:

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