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a girl with a ball-on-a-string stands out of the sunroof of a car. She holds one...

a girl with a ball-on-a-string stands out of the sunroof of a car. She holds one end of the string and lets the ball hang freely. The car is traveling around a 40m radius curve on a horizontal track at a constant speed of 10m/s. Due to the car's turn the ball makes an angle theta with respect to the vertical direction as shown in the figure. Find theta with respect to the vertical direction as shown in the figure.

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