Arock is thrown downward from an unknown height above the ground with an initial speed of 21m/s. it strikes the ground 8s later. determine the initial height of the rock above the ground. the acceleration of gravity is 9m/s/s. answer in units of m

Given:
initial velocity (u) = 21 m/s
time (t) = 8 seconds
acceleration (a) = 9 m/s²
distance (s) = ????????
Now,
you can use the formula, 

Now, plug the values in the formula, and you get:













SO THE INITIAL HEIGHT OF THE ROCK WAS 456 METERS.

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