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Several physics application questions are urgent! 1. The length of an aircraft carrier is 160 meters, and the take-off speed of an aircraft is 40 m / s (1) What is the minimum acceleration for an aircraft to start taxiing at a uniform acceleration on the runway and then take off? (2) If only one aircraft is allowed to taxi on each runway, how many aircraft can take off at most per minute? 2. The normal running speed of the train from station a to station B is 60km / h. once the train started from station a, because it was delayed for 5min, it had to speed up, so that when the average speed was 72km / h, it could just arrive at station B on time, and the movement of the train was set as a straight line (1) What is the normal running time of the train from station a to station B? (2) What is the distance from station a to station B? 3. There are two people, a and B. A is 90m to the south of B. they are moving in a straight line at the same time. A is driving to the east at the speed of 2m / s, and B is driving to the south at the speed of 3m / s. The distance between the two people is calculated after 20s The answers to the questions in the reference book are missing
1 (1) according to the formula VT ^ 2-v0 ^ 2 = 2As, V ^ 2-0 = 2As is known, v = 40m / s, s = 160m is substituted into the solution to get a = 5m / S ^ 2 (2) if all aircraft can only accelerate with the acceleration in (1), then the formula s = 1 / 2at ^ 2 (substituted into the data in 1) gets t = 8s1min = 60s, so the aircraft can take off
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