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Kinetic energy of a crane carrying a mass - swing of mass

Bridge crane carrying load sudden stop swing how far

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We will use the conservation of energy to solve this...

The crane is moving with a uniform velocity of 10ft/s. Thus the mass tied to it is also moving with that speed...right ?

what's the Kinetic Energy of this mass ?
Ke = 1/2 m v^2

when the crane ...

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