Answer:
60.6 m
Explanation:
For vertical displacement of 80 m , initial velocity downwards u = 0
h = ut + 1/2 g t²
80 = 0 + 1/2 x 9.8 x t²
t = 4.04 s
During this period , rock will be displaced horizontally with uniform velocity .
horizontal displacement = 15 x 4.04 = 60.6 m .
