A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (g = 10ms-2)
-
A.
9s -
B.
4.5s -
C.
6s -
D.
7.5s -
E.
3s
Correct Answer: Option E
Explanation
Using the equation of motion
S = ut + (frac{1}{2})at2
45 = (0 x t) + ((frac{1}{2}) x 10 x t2)
t = 3s