Homework Help: Physics

Posted by Alan Thomas on Thursday, January 14, 2010 at 5:48pm.

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 23 m/s. The cliff is h = 54 m above the water's surface. How long does it take for the stone to fall to the water?

With what speed does it strike the water?

Physics - bobpursley, Thursday, January 14, 2010 at 5:49pm
If the initial velocity is horizontal, it has not influence on the time of fall.
Time of fall is determined by the height, and by gravity.

h=1/2 g t^2
solve for t, time.
Physics - Alan Thomas, Thursday, January 14, 2010 at 5:50pm
Thank you.
Physics - Alan Thomas, Thursday, January 14, 2010 at 5:51pm
How would I calculate the speed?
Physics - bobpursley, Thursday, January 14, 2010 at 5:53pm
the vertical speed is
vf= g *time

the horizontal speed is the kicking speed.

Vftotal=sqrt (Vh^2+ Vvf^2)

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