# physics

a person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18 ms. The cliff is 52m above the waters surface. How long does it take for the stone to fall to the water? With what speed does it strike the water?

1. 👍 0
2. 👎 0
3. 👁 732
1. Since the stone start with no initial vertical velocity component, the time T to hit the water is given by

H = 52 m = (1/2) g T^2
T = sqrt(2H/g)

The speed V2 when it hits the surface is most easily computed using energy conservation.

(1/2) m V2^2 = (1/2) m V1^2 + m g H
V2^2 = V1^2 + 2gH

V1 is the initial velocity, 18 m/s.
You know what g is, I assume.

1. 👍 0
2. 👎 0
posted by drwls
2. e=mc^2

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

A person standing at the edge of a seaside cliff kicks a stone horizontally over the edge with a speed of 14.3 m/s. The cliff is 47.6 m above the water's surface. How far in meters from the base of the cliff does the stone land?

asked by Asia on November 13, 2012
2. ### Physics

A person standing at the edge of a seaside cliff kicks a stone horizontally over the edge with a speed of 14.3 m/s. The cliff is 47.6 m above the water's surface. How far in meters from the base of the cliff does the stone land?

asked by Asia on November 13, 2012
3. ### physics

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 11 m/s. The cliff is h = 47 m above the water's surface, as shown below.

asked by steph on September 27, 2009
4. ### norma

A person standing at the edge of a seaside cliﬀ kicks a stone over the edge with a speed of 12 m/s. The cliﬀ is 41 m above the water’s surface, How long does it take for the stone to fall to the water? The acceleration of

asked by norma on October 23, 2011
5. ### Physics

a person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 10 m/s. the cliff is 48 m above the water's surface as shown. how long does it take for the stone to fall to the water? the acceleration

asked by Kenny on October 17, 2014
6. ### Physics

A person standing at the edge of a seaside cliﬀ kicks a stone over the edge with a speed of 21 m/s. The cliﬀ is 52 m above the water’s surface. How long does it take for the stone to fall to the water? The acceleration of

asked by Dylan on January 28, 2013
7. ### physics

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 11 m/s. The cliff is h = 55 m above the water's surface, as shown below. How long does it take for the stone to fall to the water?

asked by andrew on December 9, 2009
8. ### Physics

a person standing at the edge of a seaside cliff kicks a stone horizontally over the edge with speed of 31 m/s cliff is 51 m above water. how far from base of cliff does stone land and what is speed of stone when it hits water

asked by Anonymous on December 17, 2014
9. ### physics

a person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18 m/s. the cliff is 52 m above the waters surface. how long does it take for the stone to fall to the water? with what speed does it

asked by donnie on February 10, 2010
10. ### physics

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18m/s. The cliff is 52 meters above the waters surface. How long does it take for the stone to fall to the water? with what speed does it

asked by anonymous on November 6, 2010

More Similar Questions