Answer to Question #120740 in Mechanics | Relativity for Zainab

Question #120740
A car covers first half of the distance between two places at a speed of 80km/hr and
the second half at 60km/hr. What is the average speed of the car?
1
Expert's answer
2020-06-08T10:25:21-0400

"v_{avr}=\\frac{S\/2+S\/2}{t_1+t_2}=\\frac{S\/2+S\/2}{S\/(2v_1)+S\/(2v_2)}=\\frac{v_1v_2}{v_1+v_2}=\\frac{80\\cdot 60}{80+60}=34.3km\/hr"











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