Question

A rock is dropped from a 134-m-high cliff. how long does it take to fall (a) the first 67.0 m and (b) the second 67.0 m?

Answer 1

A rock is dropped from a 100-m-high cliff. How long do the first 50 meters and the second 50 meters take to fall?

(a) The first 50 meters:

h1 = 0.5 x a x t12

50 m = 0.5% x 9.8% x t12

t1 = 3.19 s

50 meter fall time equals 3.19 seconds.

(a) Counting all 100 meters:

h2 = 0.5 x a x t22

100 m = 0.5% x 9.8% x t22

t2 = 4.52 s

Time to fall 50 meters is equal to t2 - t1 = 1.33 s.

What is meter?

The Earth's circumference is around 40000 km, according to the original definition of the metre in 1793, which was one ten-millionth of the distance between the equator and the North Pole on a great circle. The metre was redefined in 1799 using a model metre bar (the actual bar used was changed in 1889). The definition of the metre in terms of a certain number of wavelengths of a specific krypton-86 emission line was made in 1960.

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