- #1
IamVector
- 98
- 9
- Homework Statement
- What is the minimum initial velocity that has to be
given to a stone in order to throw it across a sloped roof? The
roof has width b, its two edges have heights a and c.
- Relevant Equations
- To find a minimum (or a maximum), we have to
vary free parameters (in this case the throwing point and the
angle) by infinitesimally small increments and see what hap-
pens to the quantity of interest. If it increases for all allowed
variations, we have found a minimum.
And
For a free-fall of a body, there is an integral of mo-
tion (quantity which is conserved), 1/2v^2 − gh, where v is an
instantaneous speed, and h is the current height of the body.
(I don't have slightest idea what to do after )
any geometric approach??