A block rests on a horizontal frictionless surface a string, Physics

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A block rests on a horizontal frictionless surface a string

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. 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?

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Physics: A block rests on a horizontal frictionless surface a string

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