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jp0108
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Homework Statement
A young woman named Kathy Kool buys a
sports car that can accelerate at the rate of
4.56 m/s2. She decides to test the car by drag
racing with another speedster, Stan Speedy.
Both start from rest, but experienced Stan
leaves the starting line 0.51 s before Kathy.
Stan moves with a constant acceleration of
3.43 m/s2 and Kathy maintains an accelera-
tion of 4.56 m/s2.
Find the time it takes Kathy to overtake
Stan. Answer in units of s.
The formulas are:
vf = vi + at
d = vit + 1/2at^2
vf^2 = vi^2 + 2ad
d = 1/2 (vi + vf) delta t
a = delta v/ t
v = d/t
KEY:
v: m/s
d: m
t: s
a: m/s^2
vi: initial velocity
vf: finial velocity
delta v: change in velocity
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