- #1
tigerlili
- 62
- 0
Homework Statement
a stone is projected at a cliff of height h with an initial speed of 46.0 m/s directed at an angle θ0 = 65.0° above the horizontal. The stone strikes at A, 5.47 s after launching. Find (a) the height h of the cliff, (b) the speed of the stone just before impact at A, and (c) the maximum height H reached above the ground.
Homework Equations
v0x= vcostheta
v0y= vsintheta
vfy= v0y-gt
The Attempt at a Solution
first, i broke the vector up into components
v0x= 19.44
v0y= 41.69
vfy= v0y-gt
y= -1/2gt^2 +v0yt + y0
then i tried to find b) the speed of the stone
i did vfy= v0y-gt
and got -11.92
that was wrong
i'm pretty lost when it comes to the other stuff.. please help?