AP Physics 1 Question 194: Answer and Explanation
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4. A rock is dropped off a cliff and strikes the ground with an impact velocity of 30 m/s. How high was the cliff?
- A. 20 m
- B. 30 m
- C. 45 m
- D. 60 m
Correct Answer: C
Use Big Five #5 with v0 = 0 (calling down the positive direction):