An observer in a boat accelerating horizontally with a constant acceleration watches a stone dropped from rest (relative to the boat) from the top of a mast, and then a second stone thrown vertically

Question

An observer in a boat accelerating horizontally with a constant acceleration watches a stone dropped from rest (relative to the boat) from the top of a mast, and then a second stone thrown vertically downward from the same point. In the frame of the boat, the paths of the two stones are:

TestHub · Accepted Answer

In the boat frame a constant pseudo-force acts horizontally, so the effective acceleration of every stone is a constant vector (gravity plus pseudo-acceleration). The dropped stone starts from rest in this frame and moves along a straight line along the effective acceleration. The thrown stone starts with a vertical velocity not parallel to the effective acceleration, which is exactly projectile motion: a parabola. Option C.

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