SOLUTION: Find the velocity of a stone after it has fallen 100 feet

Algebra ->  Triangles -> SOLUTION: Find the velocity of a stone after it has fallen 100 feet       Log On


   

Question 1173602: Find the velocity of a stone after it has fallen 100 feet
Answer by ikleyn(52824) About Me  (Show Source):
You can put this solution on YOUR website!
.

Physicist writes the equation  of conservation energy


    %28mv%5E2%29%2F2 = mgh,


cancel the mass  "m"  in both sides, and get that required formula


    v%5E2 = 2gh,   or   v = sqrt%282gh%29.


Then he substitutes  g = 32 m/s^2,  h = 100 ft,  and get the ANSWER


    v = sqrt%282%2A32%2A100%29 = 10%2Asqrt%2864%29 = 10*8 = 80 ft/s.

Solved.