I am riding along in the passenger seat of a car, holding a helium-filled balloo

Question

I am riding along in the passenger seat of a car, holding a helium-filled balloon on a string. The car is going forwards at a smooth 45 miles per hour, which means the balloon floats on its string right above my hand. Use the Equivalence Principle to answer the following question: When the driver slams on the brakes, what happens to the balloon (assuming that I keep a hold on the bottom of its string)? Does the balloon stay straight up? Does it shoot towards the back of the car? Towards the front?

Explanation / Answer

it shoot towards towards the front of car becauseif intertia if motion when car moves with speed of 45 i.e ballon moves withspeed of 45 so when brakes of car applied then only car stop but intertiaof motion tends the ballon to move forward with velocityof 45 for some moment ,so ballon moves towards front ofcar .

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