Brain Challenge (Post #4)

Brains get bored of learning spelling and doing hard sums, so why not try a few of the puzzles below and keep your brains interested

Make sure you think outside the box and then post your answer inside the box below

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#4 Balloon in a truck

A truck stops to rest at some traffic lights. Inside the back of the truck is a single helium balloon attached to the floor by a single thread. There is nothing else in the back of the truck and it is closed off to all the surroundings. As the traffic lights turn green and the truck accelerates forward, which direction does the balloon move in?

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