(continued) If this girl keeps this acceleration to run at 87 street, which of t
ID: 1581414 • Letter: #
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(continued) If this girl keeps this acceleration to run at 87 street, which of the following is a correct form of equation x=xo+ vot 7. at' A) 87 st=89 st+(6.0 m/s)t+ at2 B) 87 st-89 st-(6.0 m/s) at2 C) 87 st=89 st-(6.0 m/s)t--at2 D) -87st=-89 st-(6.0 m/s)ngat2 (continued) What does the time t mean in Question 7? A) the time the girl runs from 89 street to 87 street B) the time the girl runs from 88 street to 87 street C) the time the girl runs from 89 street to 88 street D) the time her watch shows at 87st What is the acceleration of free-fall objects? A) +9.8 m/s 2 when thrown up and -9.8 m/s 2 when fell down B) -9.8 m/s42 when thrown up and +9.8 m/s 2 when fell down C) +9.8 m/s 2 all the time no matter thrown up or fell down D) -9.8 m/sA2 all the time no matter thrown up fell down E) positive or negative depends on how you chose positive direction, but magnitude is always 8. 9. 9.8m/s42 10. At the peak point (maximum height point) of a projectile, A) the velocity is maximum in magnitude B) the acceleration is maximum C) the velocity is minimum in magnitude D) the acceleration is minimum 2. Choose two (each is 5 points) If you choose more, you may get extra credit to compensate your lost points (1) A small airport has runway 150 m long. An airplane can accelerate at 2.5m/s42 and take off at leas at speed 27m/s. Please estimate if this airplane can take off at this small airport?Explanation / Answer
9) E) signs depend on the convention used, though the magnitude always remains 9.8 m/s2
10) C) the velocity is minimum in magnitude at the peak point.
as the horizontal component remains the same (constant) throughout, the vertical component of velocity becomes zero at the peak point
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