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2-D Kinematics: Problem-Solving

A ball is thrown horizontally at a speed of 30 m/s off a cliff that is 25m high. At what angle does it strike the ground below? The ground is horizontal, and you can neglect air resistance.

1. Draw a picture of the situation, and label it carefully.

2. Write down what you know (what information the problem gives you).

3. Decide how the special circumstances of the problem can be represented mathematically.

4. What general principle(s) apply?

5. What equations are available for this general principle?

6. Choose what steps are needed now to apply these equations to your problem, and go ahead and solve for your unknown(s). Don't forget units.

7. Check your answer: is it reasonable? If the answer is a formula, does it give the right answer for special cases?