The first section of the path of 400m, the body moved at a speed of 20m / s, and then passed another 500m

The first section of the path of 400m, the body moved at a speed of 20m / s, and then passed another 500m in 30s, find the average speed of the body along the entire path

Initial data: S1 (length of the first section of the track) = 400 m; V1 (speed on the first section of the path) = 20 m / s; S2 (length of the second track section) = 500 m; t2 (time of passage of the second section of the path) = 30 s.

Let’s define the formula for calculating the average speed: Vav. = (S1 + S2) / (t1 + t2) = (S1 + S2) / (S1 / V1 + t2).

Let’s calculate: Vav. = (400 + 500) / (400/20 + 30) = 900 / (20 + 30) = 900/50 = 18 m / s.

Answer: The average speed of body movement along the entire path is 18 m / s.