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m/s when entering the intersection. a) [6pt] What was the speed of the Volkswagen just before the collision? Conservation of momentum implies that
,
where
and
are the momenta of
the Cadillac and Volkswagen, respectively, and
is the final momentum.
The
geometry is as shown in the figure, with
The
figure shows that
so we find that 3 b) [6pt] What was the speed of the two cars together the instant after the collision?
Referring again to the triangle above, so Alternatively, the Pythagorean theorem can be used to obtain
leads to , which c) [5pt] How much kinetic energy was lost in the collision? (This energy would have done work
– damage – on the vehicles, and could also be converted to heat, vibrations, sound, and other
forms of energy.) *If you don’t have an answer to (a) and (b), you may assume they were 20
m/s and 10 m/s, respectively, when answering this question.]
The initial kinetic energy of the Cadillac is The initial kinetic energy of the Volkswagen is The final kinetic energy is Then 4 3. [16pt] Answer these multiplechoice questions by circling the correct letter. Showing your
work is not required, but partial credit is possible if you show your work.
(a)...
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This document was uploaded on 03/09/2014 for the course PHYS 221 at Ohio Northern University.
 Fall '12
 ScottYost
 Physics, Work

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