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Q. A projectile, fired with unknown initial velocity, lands 18.8s later on the side of a hill, 3140 m away horizontally and 433 m perpendicularly above its starting point. What is the vertical component of its initial velocity?

Q. A 160 g ball on a 70.70 cm long string is swung in a vertical circle about a point 184 cm above the floor. The string all of a sudden breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 543 cm above the floor. What was the tension in the string an instant before it broke?

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