a body is projected horizonatlly from the top of a cliff 45m above the ground. if the body lands at a distance 30m from the foot of the cliff, calculate the speed of projection. [g = 10ms-2]
-
A.
10ms-1 -
B.
15ms-1 -
C.
20ms-1 -
D.
30ms-1
Correct Answer: Option D
Explanation
V2 = U2 + 2gh
= 02 + 2 x 10 x 45 = 30