Homework Help: phy

Posted by nicky on Friday, October 12, 2012 at 2:50pm.

A stone is thrown upward from the edge of a cliff overlooking the ocean. The initial speed of the stone is 20m/s, and it's thrown up at an angel of 30 degrees with respect to the horizontal. the cliff is 45m above the ocean surface. How long is the stone in flight before striking the water?

phy - bobpursley, Friday, October 12, 2012 at 3:06pm
in the vertical:
hf=hi+vi*t-4.9t^2
0=45+20*sin30*t-4.9t^2

put that in standard form for a quadratic
at^2+bt+c=0

use the quadratic equation

t=(-b+-sqrt(b^2-4ac))/2a

Answer this Question

Related Questions

physics - A stone is thrown horizontally with an initial speed of 10 m/s from ...
physics - 9. A stone is thrown at an angle of 30° above the horizontal from...
Physics - A stone is thrown straight upward with a speed of 12 m/s from the edge...
science - A stone is thrown vertically upward with a speed of 11.0 m/s from the ...
physics - A stone is thrown vertically upward with a speed of 10.0 m/s from the ...
Physics - A stone is thrown vertically upward with a speed of 12.0 m/s from the ...
Physics - A stone is thrown horizontally from the top of a 25.00 m cliff. The ...
physics - A stone is thrown vertically upward with a speed of 14.0 m/s from the ...
Physics Honors - A rock is thrown horizontally from a cliff overlooking the ...
physics - A stone is thrown vertically upward with a speed of 11.5 m/s from the ...

For Further Reading

First Name:
School Subject:
Answer: