Physics Problem can someone help me out!?

[The8]

What is the magnitude of deceleration of 10,000 kg car that has an air filled balloon hanging from its rear view mirror, if while decelerating, the string of the balloon forms an 30° angle with respect to the vertical? Note that sin 30° = 0.500; cos 30° = 0.866; and tan 30° = 0.57

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