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(D) When the car takes a left turn,it undergoes centripetal acceleration directed towards the center of the turn (left). Due to inertia,the air inside

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Be thrown to the left side

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(D) When the car takes a left turn,it undergoes centripetal acceleration directed towards the center of the turn (left). Due to inertia,the air inside the car tends to move in a straight line,but because the car is enclosed,the air experiences a pseudo-force directed towards the right. Since the air is denser than the helium-filled balloon,the air is pushed towards the right side of the car due to this pseudo-force. This displacement of the denser air towards the right creates a pressure gradient that pushes the lighter helium balloon towards the left. Therefore,the balloon will be thrown to the left side.

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