Adriver of a car traveling 12 m/s applies the breaks. after 2 seconds the speed drops to 8 m/s what is the cars acceleration?

Deceleration of the car is 2.

Explanation:

Given:

initial speed = 12 m/s

final speed = 8 m/s

time = 2 s

To find:

acceleration = ?

Formula used:

According to first kinematic equation:

v = u + a t

Where, v = final speed

u = initial speed

t = time

a = acceleration

Solution:

According to first kinematic equation:

v = u + a t

Where, v = final speed

u = initial speed

t = time

a = acceleration

8 = 12 + 2 a

-4 = 2 a

a = -2

The negative sign implies that it is deceleration. Thus, deceleration of the car is 2.

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