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How long until person on fifth floor see ball by window

A person on the 20th floor (66 m above ground) of a building reaches out and throws a ball directly upwards at 13 m/s. How long (secs) until a person on the 5th floor (16.5 m) see the ball go by the window?

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## Q : Problem based on gauge pressure in the tires

Suppose that when you ride on your 7.60-kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 78.5 lb/in2 and the area of contact between each tire and the road is 7.13 cm2, what is you