Walker writes the formula for acceleration incorrectly on the blackboard. It should be f/s2, where he writes (f/s)2. Then, a student says: "Don't you have to assume that the velocity is constant during the deceleration period?", and Walker partly agrees. Deceleration means that the velocity (or rather the speed) diminishes - constant velocity means there is no deceleration or acceleration. A physics teacher should never make these mistakes.

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