Physics, 18.08.2019 18:50 sjdpdpisdjsipjd7327

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

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Arock is thrown downward from an unknown height above the ground with an initial speed of 21m/s. it...