The car drove for 10 seconds at a speed of 10 km / h and why did it drive for another 2 minutes
| August 6, 2021 | education
The car drove for 10 seconds at a speed of 10 km / h and why did it drive for another 2 minutes at a speed of 20 m / s. Determine the average vehicle speed.
V1 = 10 km / h = 2.7 m / s.
V2 = 20 m / s.
t1 = 10 s.
t2 = 2 min = 120 s.
Vav -?
In order to find the average vehicle speed Vav, it is necessary to divide the entire path of movement S by the time of movement t: Vav = S / t.
S = S1 + S2, where S1 is the path of the first part of the path, S2 is the path of the second part of the path.
S1 = V1 * t1.
S2 = V2 * t2.
t = t1 + t2.
Vav = (V1 * t1 + V2 * t2) / (t1 + t2).
Vav = (2.7 m / s * 10 s + 20 m / s * 120 s) / (10 s + 120 s) = 18.67 m / s.
Answer: the average vehicle speed is Vav = 18.67 m / s.
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