Acar travels along a straight line at a constant speed of 56.0 mi/h for a distance d and then another distance d in the same direction at another constant speed. the average velocity for the entire trip is 33.5 mi/h. (a) what is the constant speed with which the car moved during the second distance d?
i started out with vxavg=(vxi+vxf)/2 and came out to 11 and it was wrong. if anyone has a good website i can use to learn physics it would be much appreciated.