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You can measure acceleration (or deceleration) using a smartphone:Good point. He could measure his deceleration, and give us a screen shot to prove it was well over one "gee." But we'd have to trust that he wouldn't fake the exercise!
<https://play.google.com/store/search?q=accelerometer&c=apps>
Measurements are always useful as a sanity check.
I believe that you'll find that the acceleration (or deceleration) isRight. That's why I pointed out that he'd need to immediately and precisely reach and maintain absolute maximum deceleration. Any deviation - like taking half a second to get the braking precisely right - would add to his stopping distance.
not constant and varies substantially. To properly compare calculated
and measured AVERAGE acceleration, you'll need to collect some data
and crunch the numbers.
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