Question

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

Answer 1

time=sqrt(2*145/9.8)

Answer 2

b.2.9 s

Answer 3

5.4 s

Answer 4

5.4s