During the first half of the flight time, the plane moved at a speed of 600

| September 27, 2021 | education

During the first half of the flight time, the plane moved at a speed of 600 km / s, and the rest of the time, at a speed of 800 km / s. Find the average speed of the plane.

Average speed is the ratio of the path to the time it takes to travel a given path. In this case, the speed of movement does not have to be constant.

Here Vav is the average speed, S is the entire path traversed by the body, t is the travel time of the body. Average speed is a scalar. If the body moved at different speeds in equal periods of time, then the average speed will be equal to the arithmetic average of all speeds.

S1 = S2 = S / 2;

v1 = 600 km / h, v2 = 800 km / h

Answer: Vav = (S1 + S2) / (t1 + t2) = S / (S / 2v1 + S / 2v2) = 2v1v2 / (v1 + v2) = 2 * 600 * 800 / (600 + 800).



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