- #1
Senjai
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Homework Statement
How far would a 1.00 Kg ball have to fall freely to reach a speed of 100 Km/h ?
Homework Equations
[tex] \Delta E_g = \Delta E_k [/tex]
The Attempt at a Solution
[tex] \Delta E_g = \Delta E_k [/tex]
i then expanded to:
[tex] mgh' - mgh = \frac{1}{2}m(v')^2 - \frac{1}{2}mv^2 [/tex]
i got rid of the 1/2's and the mass
and 0'd out the equatiosthat would equal zero…
[tex] 2gh' = -(v')^2 [/tex]
[tex] h' = \frac{-(v')^2}{2g} [/tex]
subbed in the variables and ot 5.1 x 10^2 J.. which is wrong..
appreciate any help... thanks.