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4. A fleeing boat is 30.0 m from the base of a 100 meter-high cliff when it passes a red stationary marker. A cannon, mounted on the edge of the cliff fires a shell 2.0 seconds after the boat passes the marker. The cannon shell has initial speed of 26 m/s and is fired 50° above the horizontal. The shell manages to hit the boat in exactly in the centre. Note: ignore the height of the cannon.

Fig: 1