5. If we think 23d street as X axis pointing to the east, and a girl is running

Question

5. If we think 23d street as X axis pointing to the east, and a girl is running from 89 street to 88 street, her displacement is 23rd Ave 23rd Ave 23rd Ave The Ke Chutc LGA Rentel Cars 88 street A) 89 street-88 street 1 block 87 street B) 88 street-89 street 1 block C) 1 block no matter positive or negative 89 street 6. (continued) If this girl has velocity 6.0 m/s at 89 street, and 4.0 m/s at 88 street 10 seconds later her average acceleration is A) (6.0m/s-4.0m/s)(10s)=0.2m/s^2 B) (4.0m/s-6.0m/s)/(10s)-0.2m/s 2 C) (-4.0m/s(-6.0m/s))/(10s)=0.2m/s^2 D) (-6.0m/s-(-4.0m/s)/(10s)--0.2m/s42

Explanation / Answer

5. B) 88 street - 89 street = -1 block

6. C) as the velocity is in the negative direction,

final velocity = -4 m/s

initial velocity = -6 m/s

acceleration = (-4 - (-6))/10 = 0.2 m/s2

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