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If you laugh, you're going to hell.

Some say he still hasn't had that coffee...
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DaCostaBR: The acceleration would be the force divided by zero, there's the problem. But if we were to assume the mass only tends to zero, the acceleration would tend to infinity, resulting in infinite velocity. That's why Newtonian physics can't be applied to Quantum physics.
No no, this is actually a trick question. She said a massless marble. Massless! That means it's a ghost marble. It doesn't matter how much force is applied, it will pass through the marble and not move it at all.

:P