gc physics textbook chapter 6 problems (id: 605a08e12)

本题目来源于试卷: gc physics textbook chapter 6 problems，类别为 IB物理学

[问答题]
A ball is attached to a horc;wf-vr a-5 ajizonmeg :)ffw e49ftal cord of length L whose other end is fixed (Fig. 6–49wf) eeg:fm4 f3).
(a) If the ball is released, what will be its speed at the lowest point of its path?
(b) A peg is located a distance h directly below the point of attachment of the cord. If h=0.8L what will be the speed of the ball when it reaches the top of its circular path about the peg?

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