* 1. After watching the solutions video, did your answer to question 1 (mystery cylinder) change?

* 2. After watching the solutions video, did your answer to question 2 (bike) change?

* 3. After watching the solutions video, did your answer to question 3 (average speed) change?

* 4. After watching the solutions video, did your answer to question 4 (train) change?

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