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July 29, 2014

July 29, 2014

Posted by **Mathew** on Thursday, February 2, 2012 at 12:55am.

Calculate the distance she travels before she catches him.

Calculate the speed of Kathy's car at the instant she overtakes Stan.

Calculate the speed of Stan's car at the instant he is overtaken by Kathy.

- Physics -
**Henry**, Friday, February 3, 2012 at 7:43pma. d1 = d2,

0.5a*t^2 = 0.5a(0.5t-1.04)^2,

0.5*3,59t^2 = 0.5*4.77(t-1.04)^2,

1.795t^2 = 2.385(t-1.04)^2,

0.7526t^2 = t^2-2.08t+1.082,

0.7526t^2 -t^2+2.08t =1.082,

-0,2474t^2 +2.08t - 1.082 = 0,

Use Quadratic formula and get:

t = 7.85 s.

b. d = 0.5*a*t^2,

d = 0.5*4.77*(7.85)^2 = 147 m.

c. V = 4.77*7.85 = 37.44 m/s.

d. V = 3.59 * (7.85+1.04) = 3i.9 m/s.

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