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A few years ago, when I used to be a delivery guy, I once
drove a 3670-kg truck into the rear of a 1,534-kg car that
was parked in front of me (don't get me wrong, I did not
do it on purpose). The truck and car locked together and
moved at a speed of 9.18 m/s after the collision. What
was the speed at which I was driving before the
collision?