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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