This preview shows page 1. Sign up to view the full content.
Unformatted text preview: 0
m/s when entering the intersection. a) [6pt] What was the speed of the Volkswagen just before the collision? Conservation of momentum implies that
are the momenta of
the Cadillac and Volkswagen, respectively, and
is the final momentum.
geometry is as shown in the figure, with
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 multiple-choice questions by circling the correct letter. Showing your
work is not required, but partial credit is possible if you show your work.
View Full Document