If a stone falls past a bird on a ledge moving at 4 m/s, how fast will the stone be moving just before it hits the ground below 9 seconds later?
A. 92.2 m/s C. 352.8 m/s B. 48.2 m/s D. 36 m/s
(See answer below)
It will take 92.2 m/s for the stone be moving just before it hits the ground below 9 seconds later.
u=4 m/s, t = 9 s
v = u + gt
or, v = 4 + 9.8 * 9
= 4 + 88.2
= 92.2 m/s
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