That depends on how fast the truck is traveling.
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The distance travelled will depend on many factors other than the mass and speed of the truck. For example, the road conditions (wet/dry), the state of the tyres and the brakes.
Stopping Distance = about 56.25 feet.
55 feet
If you have another piece of information, like "the truck is slowing down at a rate of 30m/s2", then you would be able to work this out, but without additional information, this question can not be accurately answered.
On dry roads with ABS, around 46 feet.