A car decreases its speed from 80 km/hr to 60 km/hr in 5 seconds. The acceleration of the car is :

-1.11 m/s²

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1.12 m/s²

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-1.14 m/s²

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1.11 m/s²

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Solution

The correct option is A
-1.11 m/s²

Here,

Intial velocity $u$ = 80 km/h = 22.22 m/s

Final velocity $v$ = 60 km/h = 16.67 m/s

Time taken $t$ = 5s

Using, a = $\frac{v - u}{t}$

a = $\frac{16.67 - 22.22}{5}$ $m / s^{2}$

a = - 1.11 $m / s^{2}$

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