A rock falls off the edge of a cliff that is 145 m above the ground beneath it. For how long a time is the rock falling? Assume air resistance is negligible.

A. 4.9 s
B. 2.9 s
C. 4.5 s
D. 3.3 s
E. 5.4 s

4 answers

time=sqrt(2*145/9.8)

b.2.9 s

5.4 s

5.4s

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