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Unformatted text preview: rooF oF the building in the direction oF the target. 5 m 10 m v The horizontal speed v with which the ball must leave the rooF iF it is to strike the target is most nearly 1. v = 5 2 m/s. 2. v = 5 2 2 m/s. correct 3. v = 5 5 m/s. 4. v = 3 5 m/s. 5. v = 5 3 m/s. 6. v = 5 3 3 m/s. 7. v = 2 5 m/s. 8. v = 2 5 m/s. 9. v = 3 5 m/s. 10. v = 5 5 m/s. Explanation: m = 5 kg , not required h = 10 m , x = 5 m , and g = 10 m / s 2 . Version 140/ACADA QTest #3 Antoniewicz (57380) 2 Observe the motion in the vertical direction only and it is a purely 1dimension movement with a constant acceleration. So the time need for the ball to hit the ground is t = r 2 h g and the horizontal speed should be v = x t for the ball to hit the target. Therefore v = x R g 2 h = (5 m) r 10 m / s 2 2 (10 m) = 5 2 m / s = 5 2 2 m / s ....
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This note was uploaded on 03/01/2011 for the course PHYS 317K taught by Professor Turner during the Spring '11 term at University of Texas at Austin.
 Spring '11
 Turner

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