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A motor car moving at a speed of 72 km ...

A motor car moving at a speed of ` 72 km //h` can not come to a stop in less than ` 3.0 s` while for a truch this time interval is ` 5.0s` On a highway the car is behind the truck both moving at `72 km //h` The truck geives a signal that it is going to stop at emergency. At what distance the car should be from the truck so that it does bot bump onto (collide with) the truck. Human responde time id ` 0.5 s`.

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