An object is dropped from the top of a tower. If it takes 4s for it to reach the ground, calculate the height of the tower.(g = 10 ms‾², ignore air resistance)

A. 20m
B. 40m
C. 80m
D. 160m

Correct Answer: Option C

C. 80m

Explanation

H = ½gt²

½×10×4²=80

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