What is the acceleration of a car that moves in a straight line and decreases its speed from 80km/hr to 15km/hr in exactly 5.0 seconds

-3.6 m/s

Explanation:

first go from km/hr to m/s

so 80km/hr⇒ 22.2222 m/s

15km/hr ⇒4.16667 m/s

now use the equation for acceleration

(4.16667-22.2222)/5 = 18.05553/ 5 = -3.611106 m/s

with sig figs

-3.6 m/s

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need to see circuit to get time constant