Tuesday

January 27, 2015

January 27, 2015

Posted by **melissa** on Monday, May 16, 2011 at 4:42pm.

A stone is thrown off a cliff. it reaches a maximum height of 30m after 2 seconds, then falls into the water below. it hits the water after 5 seconds

a) how high above the water is the cliff ( The maximum height is relative to water level )

b) what is the ' second zero' and what does it mean

- math -
**Henry**, Tuesday, May 17, 2011 at 6:23pma. h + 30 = Vo + 0.5gt^2.

h + 30 = 0 + 0.5*9.8*5^2,

h + 30 = 122.5,

h = 122.5 - 30 = 92.5m. above the wate.

b. I'm not sure what they mean by "zeroes", but the inital velocity

is zero at the beginning of the free fall which is 30m above the top of the

cliff.

**Answer this Question**

**Related Questions**

math - i really need help, i have no idea how to answer this question ! A stone ...

math - really need help, i have no idea how to answer this question ! A stone ...

math help please !!! - i really neeed help, i have no idea how to answer this ...

Math - A stone was thrown from the top of a cliff. The height, H meters, of the...

physics - A rock is thrown vertically upward from the edge of a cliff. The rock ...

physics - A rock is thrown vertically upward from the edge of a cliff. The rock ...

civil engineering - A stone (on the edge of the roof) thrown from the top of a ...

Uniswa - A stone thrown from the top of a building which is 30m is given an ...

Physics - The rock reaches a maximum height of 20.4 m above the top of the cliff...

math - A ball is thrown into the air with an upward velocity of 20 ft/s. Its ...