An object is dropped and strikes the ground 3.9 seconds later. Ignore air resistance. From what height was the object released? O A. 75 m O B. 150 m C. 19 m D. 9.8 m O E. none of the above

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A: v = 20 m/sangle = 30 degree T = 3 sec Using equation of motion V2 - U2 = 2 gh 0 - (20sin30o)2 = 2 *…

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