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QTest #3-solutions - Version 082/ABBAC QTest#3...

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Version 082/ABBAC – QTest #3 – Antoniewicz – (56445) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points A target lies flat on the ground 10 m from the side of a building that is 10 m tall, as shown below. The acceleration of gravity is 10 m / s 2 . Air resistance is negligible. A student rolls a 10 kg ball off the horizontal roof of the building in the direction of the target. 10 m 10 m v 10 m The horizontal speed v with which the ball must leave the roof if it is to strike the target is most nearly 1. v = 10 3 3 m/s. 2. v = 10 2 m/s. 3. v = 5 10 m/s. 4. v = 10 3 m/s. 5. v = 5 2 m/s. correct 6. v = 3 10 m/s. 7. v = 2 10 m/s. 8. v = 3 10 m/s. 9. v = 10 5 m/s. 10. v = 2 10 m/s. Explanation: m = 10 kg , not required h = 10 m , x = 10 m , and g = 10 m / s 2 . Observe the motion in the vertical direction only and it is a purely 1-dimension movement with a constant acceleration. So the time need for the ball to hit the ground is t =
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