# If a person moving at 18m/s increases to 60m/s in 12 seconds,what is the acceleration of said person?

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Expert Answers

sciftw | Certified Educator

The formula for acceleration is (final velocity - starting velocity) / time to change velocities.

Plug in your values into the formula, and make sure to follow the correct order of operations.

Starting velocity = 18 m/s

Final velocity = 60 m/s

Time it took to change velocities = 12 seconds.

Acceleration = (60 - 18) / 12

Acceleration = 42 / 12

Acceleration = 3.5 m/s/s

The unit for acceleration looks a bit goofy. What the unit is telling you is that the person accelerated by 3.5 m/s every single second until the final speed was reached. Sometimes it is helpful to think about the unit with miles per hour. 3.5 mi/hr/sec means that the person accelerated by a speed of 3.5 mi/hr every single second until the final speed was reached.