n the design of a rapid transit system, it is necessary to balance the average s

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n the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between stops. The more stops there are, the slower the train’s average speed. To get an idea of this problem, calculate the time it takes a train to make a 9.0-km trip in two situations: (a) the stations at which the trains must stop are 1.8 km apart (a total of 6 stations, including those at ends); and (b) the stations are 3.0 km apart (4 stations total). Assume that at each station the train accelerates at a rate of until it reaches then stays at this speed until its brakes are applied for arrival at the next station, at which time it decelerates at Assume it stops at each intermediate station for 20 s.
66. Pelicans tuck their wings and free fall straight down when diving for fish. Suppose a pelican starts its dive from a height of 16.0 m and cannot change its path once committed. If it takes a fish 0.20 s to perform evasive action, at what minimum height must it spot the pelican to escape? Assume the fish is at the surface of the water.

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