Question

You drive a car 2.0 h at 40 km/h, then 2.0 h at 80 km/h. (a) What is your average velocity? km/h (b) Do you get the same answer if you drive 120 km at each of the two speeds above? no yes

Answer 1

a)(2×40+2×80)/(2+2)=240/4=60

b)(240)/(120/40+120/80)=240/(3+1.5)

240/4.5=53.33333

no