題組內容
4. A palm tree sways back and forth with a period of 15 s, and Jack estimate the
amplitude of the motion of the treetop to be 1.5 m. Jack begins timing at some
instant after the treetop passes through the upright position, and after you have
been watching this motion for 40 s, the treetop is 0.5 m to the left of the upright
position of time.
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