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A 1200-kg car travels along a street at 18 î m/s. When it comes to an intersection, it does
not stop and it collides with a 2500-kg truck travelling at 11 ĵ m/s. The car and the truck
become completely entangled in the collision.
a) What is the magnitude and direction of the velocity of the combined car and
truck immediately after the collision?
b) How much energy is converted into heat (and sound)?

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