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Q. A 0.50 kg stone attached to a string is whirled in a horizontal circle of radius 43 cm as in the figure below. The string makes an angle of 35° with the vertical. What is the speed of the stone?

Q. A constant horizontal force Fa pushes a 2.00 kg FedEx package across a frictionless floor on which an xy coordinate system has been drawn. It gives the package's x and y velocity components versus time t. What is the magnitude of Fa?

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