A car traveling at 10 m/s starts to decelerate steadily. It comes to a complete stop in 20 seconds. What is the acceleration?

Explanation:

Your initial velocity () is 10 m/s, your time is 20 seconds. Although it is not explicitly mentioned in the problem, since you know the car comes to a stop, your final velocity () is 0 m/s.

The equation you can use to solve for acceleration (a) is

1. Plug in the numbers you do have, so your equation will look like this:

0=10+a(20)

2. Solve for a.

-10= 20a

-10/20=a

-0.5= a

a = -0.5

the entire statement is true and correct.  

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