Question

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

Answer 1

Answer:

-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

$\frac{v-v0}{t}$

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

with sig figs

-3.6 m/s