Posted by **Jen** on Saturday, October 23, 2010 at 10:39pm.

A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.90 s. How high is the cliff?

- Physics -
**MathMate**, Saturday, October 23, 2010 at 10:50pm
Use Equations of Kinematics

u = initial velocity = 0

S = distance travelled in metres

t = time in seconds

g = acceleration due to gravity = -9.81 m/s²

S = ut + (1/2)gt²

Solve for S.

- Physics -
**Jen**, Saturday, October 23, 2010 at 11:43pm
Thank you so much!

- Physics :) -
**MathMate**, Sunday, October 24, 2010 at 12:40pm
You're welcome!

- Physics -
**Sasha**, Saturday, November 27, 2010 at 2:17pm
A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 4.5 s later.

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