For instant shown, A has a speed of 100
km/hr, which increases at 8 km/hr per
second.
Car B also has a speed of 100 km/
hr which is decreasing at 8 km/hr.
Find the
acceleration that Car B appears to have to
an observer in Car A.
What is your main equation? Are we finding a
B/A
or a
A/B
?
Relative motion
A
B
A
B
/
a
a
a
a
a
a
+
=
What is a
A
?
What is a
B
?
Is it just 2.22 m/s
2
?
No, it has a tangential and a normal component –
what is a
n
?
Just v
2
/
ρ
B
Solve for a
B/A
Does it make sense?
If I am in A, it appears that B is accelerating to the left (+j in their coordinate
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 Spring '05
 staff
 Acceleration, Velocity, Car A. Given

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