The scooter travels the first 15 km of the track at a speed of 10 km / h and the next 5 km
| April 16, 2021 | education
The scooter travels the first 15 km of the track at a speed of 10 km / h and the next 5 km in 0.5 h. What is the average speed of the scooter along the way?
S1 = 15 km = 15000 m.
V1 = 10 km / h = 2.7 m / s.
S2 = 5 km = 5000 m.
t2 = 0.5 h = 1800 s.
Vav -?
To find the average speed of movement Vav, it is necessary to divide the entire traversed path S by the time of movement t: Vav = S / t.
The entire path S traveled by the scooter and the time t will be the sum: S = S1 + S2, t = t1 + t2.
The travel time of the scooter on the first section of the path is found by the formula: t1 = S1 / V1.
Vav = (S1 + S2) / (S1 / V1 + t2).
Vav = (15000 m + 5000 m) / (15000 m / 2.7 m + 1800 s) = 2.7 m / s.
Answer: the average speed of the scooter was Vav = 2.7 m / s.
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