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Homework Statement
A mobile is moving straight as following: the first portion of the road, equal to 10% of the total distance with the speed v1=10/s , and the rest with the speed v2=30m/s.
The average speed for the entire trip is?
a)25m/s b)22.5m/s c)20m/s d)15m/s
Homework Equations
[tex]\Delta v = \frac{\Delta d}{\Delta t}[/tex]
The Attempt at a Solution
I calculated the times passed for both distances, replaced them in the average speed's formula and got 25 m/s, which is a wrong answer according to the key.
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