The car covered 30 km at a speed of 15 m / s, the remaining 40 km it covered in 1 hour.
July 29, 2021 | education|
The car covered 30 km at a speed of 15 m / s, the remaining 40 km it covered in 1 hour. what is the average speed of the car along the way?
Question number 2.
v1 = 15 m / s – vehicle speed on the first leg of the path;
S1 = 30 km = 30,000 m – the first leg of the route;
S2 = 40 km = 40,000 m – the second leg of the route;
t2 = 1 h = 3600 s – the time during which the car covered the second segment of the path.
It is required to find the average speed Vav along the entire path.
Vav = S total / t total = (S1 + S2) / (t1 + t2) = (S1 + S2) / (S1 / v1 + t2) = (30000 + 40000) / (30000/15 + 3600) = 70000 / (2000 + 3600) = 70,000 / 5600 = 12.5 m / s.
Answer: The average speed is 12.5 m / s.
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