work/ energy problem from intro physics class please help...?
A professional skier reaches a speed of 56 m/s on a 30 degree ski slope. Ignoring friction, what was the minimum distance along the slope the skier would have had to travel, starting from rest?
The answer is 320 m.
I am not even sure where to start! If you can, please show me how to set this up!
Thank you
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The work done by the force of gravity, in the direction of motion, equals the kinetic energy gained;
(mgSin(30))d = (1/2)mv^2
mass cancels;
d = v^2/2gSin(30)
= (3136)/(9.8)
= 320 m
appears like those are "easy physics" classes... "annoying physics" classes use calculus. considering the fact that those classes are for non-technology majors, the scholars at the instant are not estimated to appreciate calculus. the 2nd direction probable contains waves & fields (sound, gentle, electricity & magnetism.) The labs will contain taking the preparation discovered in college and proving it. (no longer something pungent or messy such as you need to do in chemistry and biology.) .