In Fig. 4-2I, suppose that Barbara\"s velocity relative to Alex is a constant vBA = 52 km/h and car P is moving in the negative direction of the x axis. (a) If Alex measures a constant vPA = -78 km/h for car P, what velocity vPB will Barbara measure?
Fig. 4-21 Alex (frame A) and Barbara (frame B) watch car P, as both B and P move at different velocities along the common x axis of the two frames. At the instant shown, xBA is the coordinate of B in the A frame. Also, P is at coordinate xPA in the B frame and coordinate xPA = xPB + xBA in the A frame.
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