Riddle

Helium balloon in car accelerating forward. Direction?

Choose an answer

A.Backward
B.It stays still
C.It pops
D.Forward
Hint: It's a word with 7 letters, starting with "F".

Answer

Forward

Why this is the answer

In an accelerating car, heavier air is pushed to the back. This creates a pressure gradient that 'buoys' the lighter helium balloon toward the front.

This riddle is filed under Expert Riddles for Adults and rated Hard.