Answer to Question #81667 in Classical Mechanics for Youssef M Tawfik

Classical Mechanics

Question #81667

A car moves 30km/hr for 10 minutes and 50km/hr for 20 minutes. What is its average speed?

Expert's answer

The average speed is
v_av=L/T.
v_av=(l_1+l_2)/(t_1+t_2 )=(v_1 t_1+v_2 t_2)/(t_1+t_2 ).
v_av=(30 10/60+50 20/60)/(10/60+20/60)=43.3 km/h.

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