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A girl exerts a force of 45 N at an angle of 30˚ above the horizontal along the handle of her wagon as she pulls it 25 m across the sidewalk. How much work does she do?

A pinball machine uses a spring with a spring constant 120 N/m to launch a 50-gram ball before playing the game. If the ball launcher is pulled back a distance of 4.2 cm and then released, how fast...

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