An apple drops from the roof of a skyscraper, which is 830 m tall. Part A
Air resistance is zero. How many seconds will the apple take to reach the ground?
Express your answer in seconds.

Part B
Just before the apple hits the ground, how fast will the apple be moving?
Express your answer in meters per seconds

Hi there!

We can use the following derivations of the kinematic equations Δd = vit + 1/2at² and vf² = vi² + 2ad to solve:

A)

t = √2h/g, let g = 9.8 m/s²

Plug in the given values:

t = √2(830)/9.8 ≈ 13.05 sec

B)

Use the equation vf = √2ad:

vf = √2(9.8)(830) ≈ 127.55 m/s

the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator