A bob is suspended from a crane by a cable of length \( l=5 \mathrm{~m} \). The crane and load a...

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A bob is suspended from a crane by a cable of length \( l=5 \mathrm{~m} \). The crane and load are moving at a constant speed \( v_{0} \). The crane is stopped by a bumper and the bob on the cable swings out an angle of \( 60^{\circ} \). The initial speed \( v_{0} \) is : (Take \( \left.g=9.8 \mathrm{~m} / \mathrm{s}^{2}\right) \)
Figure 3.109
(A) \( 10 \mathrm{~m} / \mathrm{s} \)
(B) \( 7 \mathrm{~m} / \mathrm{s} \)
(C) \( 4 \mathrm{~m} / \mathrm{s} \)
(D) \( 2 \mathrm{~m} / \mathrm{s} \)
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