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A rock is dropped from a tall building. The rock's displacement in the last second before...

A rock is dropped from a tall building. The rock's displacement in the last second before hit the ground is 30.0 m. How tall is the building?
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Answer #1

Acceleration due to gravity, g = 9.8 m/s^2

The distance travelled by the rock in ' t ' seconds is ,

The distance travelled by the rock in ' t - 1' seconds is ,

Distance travelled in last second,


Substituting t = 3.56 s in Eqn (1)

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