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Honey Bee
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Homework Statement
A 250 gram rock is thrown with a speed of 30.0 m/s. It has a speed of 22.5 m/s just before it strikes the ground. Determine the work done by air resistance.
There is also a diagram which yields more information. The rocks path is horizontal and it strikes the corner of a box that is 4.60 meters tall, ricocheting the rock at a 25 degree angle. (That is, the ball is projected at a 25 degree angle from a height of 4.6 meters).
Homework Equations
Ei+Pi=Kf+Pf+(work done by air resistance)
The Attempt at a Solution
Kf=63.3J, Ki=113J Pf=0, Pi=?
I am having difficulty with the idea of the horizontal path the rock travels and the gravitational potential energy... As well as what exactly to do with the the angle of projection. I understand that I need the initial and final conditions only... but this one is really stumping me. I thank you all in advance for your considerations and help.