3. A stone is thrown horizontally at 15 m/s from the top of a cliff 44 m high. What is the velocity of the rock after 2 seconds ? -15 m/s 4. An arrow is shot horizontally from the top of a tower at a speed of 15 m/s and hits the ground with a speed of 25 m/s. Calculate the height of the tower . 5. A jet aircraft is travelling at 850 km /hr at an altitude of 11 km - when an engine falls off ! a. Neglecting air resistance, determine the speed of the engine when it hits the ground. Is this realistic? Discuss how assumptions made in the calculations might not reflect the reality of the engine's impact speed. What value might the impact speed actually be and why? b. Determine the horizontal range of the engine (measured from where the jet was located when the engine fell off ). C. Reality - Would the engine land at this point in reality ? Why or why not? Under what conditions would your solution be valid ? Where (roughly ) would it actually land