Question

A bicycle rider traveling east at 10 km/hr sees a blue car pass her appearing to travel west at 50 km/hr. What is the blue car's apparent speed for an observer riding in a red car traveling 15 km/hr west relative to the Earth?

A. 40 km/hr

B. 15 km/hr

C. 25 km/hr

D. 35 km/hr

E. 65 km/hr

Answer 1

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given, Veycle, Ground 10 km . p North (5) wat East . "South. ho Mangsar, cycle = 50 m (-1) Vredcar, ground = 15 tum (9) : Moluccar: red car ? we have, Tanecor, cycle = Value car, grounds - 509 Volue car, ground - loi Ublue car, ground =-40 1 ta

nd M . Vale cor, redor = Toneer, ground -Vrelor , ground = -401- (-15) = -25 Means, velocity of blue car writi redar = 25 km west. And option (c) is true