During a portion of a vertical loop, an airplane flies in an arc of radius ρ = 605 m with a constant speed v = 465 km/h. when the airplane is at a, the angle made by v with the horizontal is β = 35°, and radar tracking gives r = 813 m and θ = 21°. calculate vr, vθ, ar, and theta overscript two-dots endscripts for this instant.