JAMB - Physics (1978 - No. 4)
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)
9s
4.5s
6s
7.5s
3s
解释
Using the equation of motion
S = ut + \(\frac{1}{2}\)at2
45 = (0 x t) + (\(\frac{1}{2}\) x 10 x t2)
t = 3s
S = ut + \(\frac{1}{2}\)at2
45 = (0 x t) + (\(\frac{1}{2}\) x 10 x t2)
t = 3s