•73 Two highways intersect as shown in Fig. 4-46. At the instant shown, a police car P is distance dp = 800 m from the intersection and moving at speed vp = 80 km/h. Motorist M is distance dm 600 m from the intersection and moving at speed VM = 60 km/h. M VM dM P Vp (H) dp Figure 4-46 Problem 73. (a) In unit-vector notation, what is the velocity of the motorist with respect to the police car? (b) For the instant shown in Fig. 4-46, what is the angle between the velocity found in (a) and the line of sight between the two cars? (c) If the cars maintain their veloci- ties, do the answers to (a) and (b) change as the cars move nearer the intersection?

•73 Two highways intersect as shown in Fig. 4-46. At the instant shown, a police car P is distance dp = 800 m from the intersection and moving at speed vp = 80 km/h. Motorist M is distance dm 600 m from the intersection and moving at speed VM = 60 km/h. M VM dM P Vp (H) dp Figure 4-46 Problem 73. (a) In unit-vector notation, what is the velocity of the motorist with respect to the police car? (b) For the instant shown in Fig. 4-46, what is the angle between the velocity found in (a) and the line of sight between the two cars? (c) If the cars maintain their veloci- ties, do the answers to (a) and (b) change as the cars move nearer the intersection?