Posted by Jen on .
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,
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,
Thank you so much!

Physics :) 
MathMate,
You're welcome!

Physics 
Sasha,
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.