Remember to revisit the igloo problem, seeking the alternate solution. 2/3 is indeed the answer.
Also, catch up on reading in the two energy chapters (7 and 8), focusing on the relationship between force and potential energy (derivative), discussed in 8-6.
Try also the Tarzan problem (8-25).
Am I the only one who did a double take when the book matter-of-factly used a flying duck as an example...?
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