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A ball is dropped from the top of an 80 m building. Does it reach the ground in 4.0 s? (Hint: See Figure 2.7.) With what speed does the ball in Exercise 15 hit the ground?
Exercise 15
A car travels on a straight, level road.
(a) Starting from rest, the car is going 44 ft/s (30 mi/h) at the end of 5.0 s. What is the car's average acceleration in ft/s2?
(b) In 4.0 more seconds, the car is going 88 ft/s (60 mi/h). What is the car's average acceleration for this time period?
(c) The car then slows to 66 ft/s (45 mi/h) in 3.0 s. What is the average acceleration for this time period?
(d) What is the overall average acceleration for the total time? (Note these convenient British unit conversions: 60 mi/h 88 ft/s, 45 mi/h 66 ft/s, and 30 mi/h 44 ft/s.)
Compound Y contains only carbon, hydrogen, and oxygen. When a 1.000-gram sample of Compound Y is subjected to combustion analysis, 2.432 grams of CO2 and 0.574 grams of H2O are produced.
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