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A car is travelling with a speed of $36\ km/h$. The driver applied the brakes and retards the car uniformly. The car is stopped in $5\ sec.$ Find the acceleration of car.
Here given:
Initial velocity $u=36\ km/h$
Final velocity $v=0$ [Because car stopped]
Time taken to stop the car $t=5\ sec.$
On using equation, $v=u+at$
$0=36+a\times 5$
Or $5a=-36$
Or $a=-\frac{36}{5}=-7.2\ m/s^2$
Here negative $(-ve)$ sign means deceleration.
Thus, the retardation$( Negative\ acceleration)$ of the Car is $7.2\ m/s^2$
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