An orange fruit drops to the ground from the top of a tree 45m tall. How long does it takes to reach the ground? (g = 10ms-2)
-
A.
3.0s -
B.
4.5s -
C.
6.0s -
D.
7.5s -
E.
9.0s
Correct Answer: Option A
Explanation
s = ut + (frac{1}{2}gt^2)
45 = 0 + 5t2
t = 3s