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December 21, 2014

December 21, 2014

Posted by **Dave** on Wednesday, March 28, 2012 at 7:28am.

a) Find the time it takes Kathy to overtake Stan.

b) Calculate the distance she travels before she catches him.

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

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

I've looked at questions worded the same with different numbers but I just can't get it.

- Physics -
**Elena**, Wednesday, March 28, 2012 at 10:58amWhen Kathy overtakes Stan they covered

the same distances s1=s2

s1 =a1•t^2/2

s2=a2•(t+0.8)^2/2

a1•t^2/2 = a2•(t+0.8)^2/2

t = 1.93s

s1 = 4.6•(1.93)^2/2 =8.58 m

V1 = a1•t =4.6•1.93 = 8.878 m/s

V2 = a2•(t+0.8) = 3.6•2.73 = 6.33 m/s

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