Question

A race car passes its first checkpoint at a constant speed of 20 m/s and immediately begins accelerating at a rate of 10 m/s2. How long will the car take to reach the finish line 480 meters beyond the checkpoint? This problem can be represented using the following equation.

Answer 1

It will take 8 seconds

Explanation:

Answer 2

8 seconds

Explanation:

A quadratic equation always has two possible solutions, but the negative number has no significance when measuring time, so the correct answer is 8 seconds.