Posted by **HELP** on Saturday, December 11, 2010 at 10:07pm.

You accidentally throw your car keys horizontally at 10.0 m/s from a cliff 78 m high. How far from the base of the cliff should you look for the keys?

- PHYSICS -
**bobpursley**, Saturday, December 11, 2010 at 10:09pm
how much time does it take to fall 78m?

hf=1/2 g t^2

-78=1/2 9.8 t^2 solve for t.

how far horizontally? distance= 10m/s * time

- PHYSICS -
**drwls**, Saturday, December 11, 2010 at 10:11pm
The time required fir the keys to to fall H = 78 m is

T = sqrt(2H/g) = 3.99 seconds.

Multiply that by the initial velocity, which remains the constant horizontal velocity component during the fall to the ground below.

## Answer this Question

## Related Questions

- physics - You accidentally throw your car keys horizontally at 9.0 m/s from a ...
- physics - In a stunt for a movie, a remote controlled car is driven horizontally...
- physics - A car was seen driving off the edge of a cliff at an angle of 10.° ...
- Physics - A river flows off the top of a 61 m high vertical cliff. If the water ...
- physics - George, a cliff diver, begins running 3.15 m away from the edge of a ...
- Physics-Please check calculations - I posted this earler and you gave me help, ...
- Physics Honors - A ball is kicked horizontally at 8.0 m/s from a cliff 80 meters...
- physics - A missile is fired horizontally with an initial velocity of 300 m/s ...
- physics - A missile is fired horizontally with an initial velocity of 300 m/s ...
- physics - A ball is thrown horizontally from a cliff and hits the ground 4 ...

More Related Questions