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
Verified Correct Answer: E.
Physical Principles & Numerical Solution
Using the equation of motion
S = ut + \(\frac{1}{2}\)at2
45 = (0 x t) + (\(\frac{1}{2}\) x 10 x t2)
t = 3s
Source: Myschool Past Questions Archive (Record #29234)