Imagine that you are in the cabin of the ship and observe a ball suspended from a string. At some point in time

Imagine that you are in the cabin of the ship and observe a ball suspended from a string. At some point in time, the thread with the ball deviated from the vertical position in the frame of reference associated with the cabin. Can this deviation be explained using Newton’s first law?

Yes, the ball made a forward motion relative to the cabin.

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