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Q. A 0.280-kg ball is dropped from rest at a point 1.35 m above the floor. The ball rebounds straight upward to a height of 0.780 m. What are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor?

Q. A slide projector needs to create a 97.0 cm high image of a 2.20 cm tall slide. The screen is 310 cm from the slide. What focal length does the lens need? Assume that it is a thin lens.

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Category:- Physics
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