Acolony of troglodytes has been in a lengthy feud with
itsneighbors on a cliff 42m away. colony a finally develops
animportant military breakthrough. it rolls rocks off its cliff
atknown speed thus gaining pinpoint accuracy as it attacks. if a
rockis rolled at a speed of 6.9m/s, how far down the cliff will
itland?

h = 181.73 m

Explanation:

given,

distance between the neighbors = 42 m

speed of the rock rolling = 6.9 m/s

vertical velocity of ball = 0 m/s

height of the cliff = ?

time taken by the ball to travel 42 m

d = s x t  

s is the horizontal speed of the ball equal to 6.9 m/s

t = 6.09 s

same time will be taken by the ball to travel vertical distance

Using equation of motion

 h = 181.73 m

answer: point c: b. 1/2 potential, 1/2 kinetic, point a: 3/4 of its potential energy, point d or b: 3/4 potential, 1/4 kinetic

explanation: i cant explain. it's difficult to explain.

it was given as a lesson and guide for prayer.