A car moving at 12 m/s applies its brakes and comes to a stop in 2 s. What was its acceleration?

Explanation:

The acceleration of an object given it's velocity and time taken can be found by using the formula

where

a is the acceleration

v is the velocity

t is the time

From the question we have

We have the final answer as

Hope this helps you

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your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.