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January 30, 2015

January 30, 2015

Posted by **justine** on Monday, September 17, 2012 at 11:30am.

a. derive a formula for the time at w/c the ball hit the ground

b. use the formula to prove that the impact velocity by the ball is -Vo

- math -
**Steve**, Monday, September 17, 2012 at 11:33amh(t) = Vot - 1/2 a t^2

= t(Vo - a/2 t)

h=0 when t=0 or t=2Vo/a)

v(t) = Vo - at

at t=2Vo/a, v = Vo - a(2Vo/a) = -Vo

Makes sense, since the ball falls just as far as it rises.

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