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Answer on Mechanics | Relativity Question for Jordan

Question #825
A rock is dropped from a cliff. Approximately how long does it take to fall 45m if the acceleration due to gravity is 9.8 m/sec^2?
Expert's answer
From the equations of the motion
h=h0 + v0t +at2/2:
we have
h0 = gt2/2;
5 = 9.8 t2 /2;
t = sqrt (9.18) = 3.03 sec.

Answer: It will take 3 sec to fall.

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