A stone is projected vertically with a speed of 10 m/s from a point 8 metres above the ground. Find the maximum height reached. ([g = 10 ms^{-2}]).
-
A.
13 metres -
B.
15 metres -
C.
18 metres -
D.
23 metres
Correct Answer: Option A
Explanation
(v^{2} = u^{2} + 2as)
(v^{2} = u^{2} – 2gs)
(0 = 10^{2} – 2(10)s implies -100 = -20s)
(s = 5 m + 8 m = 13m) (8m is the height from where it was thrown)