The car traveled the first 60 km in 1 hour, and the second 60 km in 1.4 hours. Find the average speed of its movement.
| July 6, 2021 | education
S1 = 60 km = 60,000 m.
t1 = 1 h = 3600 s.
S2 = 60 km = 60,000 m.
t2 = 1.4 h = 5040 s.
Vav -?
The average vehicle speed Vav is the difference between the total distance traveled S to the time of its passage t: Vav = S / t.
The entire path of the car S will be the sum: S = S1 + S2.
S = 60,000 m + 60,000 m = 120,000 m.
The entire time of the car’s movement t will also be the sum: t = t1 + t2.
t = 3600 s + 5040 s = 8640 s.
Vav = 120,000 m / 8640 s = 13.88 m / s.
Answer: the average speed of the vehicle along the entire route was Vav = 13.88 m / s.
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