Energy Conservation With Conservative Forces: A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed will its gravitational potential energy (relative to the base of the cliff) be equal to its kinetic energy?
A. 3.1 m/s
B. 4.4 m/s
C. 6.3 m/s
D. 8.9 m/s
E. 13 m/s
Answer: C
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