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A 4000 kg truck is at rest at an intersection, waiting for a green light (with no other vehiclesaround)

Question

A 4000 kg truck is at rest at an intersection, waiting for a green light (with no other vehiclesaround). It

is a snowy and icy day, with no friction on the road. A 1000 kg car traveling at 5 m/s

strikes the stopped truck square on from behind. The bumpers of the two vehicles lock together

as a result of the collision, so that they skid across the intersection together.

How fast are they traveling?

 
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