Acar drives on a curved road that goes down a hill. the car's position is defined by the position vector, r={−[30.0cos(π10.0t)]i+[30.0sin(π10 .0t)]j−(azt)k} ftwhere az=11.0ft/s. the image below shows the system projected onto the x–y plane. what is the magnitude, v, of the car's velocity, v, at t = 5.00 s in ft/s