Homework Help: physics

Posted by monic on Friday, October 12, 2012 at 12:01am.

A 52-kg pole vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.

physics - Henry, Friday, October 12, 2012 at 9:13pm
hmax = (V^2-Vo^2)/2g.
hmax = 0-144/-19.6 = 7.35 m.

V = Vo + gt.
t = (V-Vo)/g = (0.7-0)/9.8 = 0.0714 s.

h = ho - 0.5g*t^2'
h = 7.35 - 4.9*(0.0714)^2 = 7.325 m. =
her Alt.

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