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A block rests on a horizontal frictionless surface. A string is attached to the block, and...

A block rests on a horizontal frictionless surface. A string is attached to the block, and is pulled with a force of 45.0 N at an angle θ above the horizontal, as shown in Figure. After the block is pulled through a distance of 1.50 m, its speed is 2.60 m/ s, and 50.0 J of work has been done on it. (a) What is the angle θ? (b) What is the mass of the block?

FIGURE

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