Throwing rocks

First, I threw a rock towards north with speed \(50 \text{ m/s}\), initially making an angle of \(40^\circ\) with the vertical. Two seconds later, I threw another rock towards east with speed \(100 \text{ m/s}\), making an initial angle of \(70^\circ\) with the vertical.

What path would the first rock appear to move in, if we looked at it in the reference frame of the second rock?

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