Which of the following is correct a b c d 1511

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Which of the following is correct? a) b) c) d)
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1/5/11 PARACHUTE OPENS During a later part of the fall, after the parachute has opened, her speed decreases from 48 to 26 m/s in 11 s. Which of the following is correct? a) b) c) d) If speed is increasing , v and a are in same direction. If speed is decreasing , v and a are in opposite
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1/5/11 1D FREE FALL -This is a nice example of constant acceleration (gravity): -In this case, acceleration is caused by the force of gravity: 1Usually pick y-axis “upward” 1Acceleration of gravity is “down”:
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1/5/11 GRAVITY FACTS -G does not depend on the nature of the material! *Galileo (1564-1642) figured this out without fancy clocks and rulers! -Normally, g=9.81 m/s2 *At the equator ° g=9.78 m/s2 *At the North pole ° g =9.83 m/s2 USE: g= 9.8 m/ s2
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1/5/11 QUESTIONS When throwing a ball straight up, which of the following is true about its velocity v and its acceleration a at the highest point in its path? a) Both v = 0 and a = 0 b) v = 0, but a = 0 c) v = 0, but a = 0
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1/5/11 BALL A ball is thrown straight up in the air and returns to its initial position. For the time the ball is in the air, which of the following statements is true? a) Both average acceleration and average velocity are zero b) Average acceleration is zero but average velocity is not zero c) Average velocity is zero but average acceleration is not zero d) Neither average acceleration nor average velocity is zero
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1/5/11 BALL You drop a ball from a window located on an upper floor of a building. It strikes the ground with speed v. You now repeat the drop, but you ask a friend down on the ground to throw another ball upward at speed v. Your friend throws the ball upward at the same moment that you drop yours from the window. At some location, the balls pass each other. This location ____________ the halfway point between window and ground.
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