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For many years Colonel John P. Stapp, USAF, held the world's land speed record. On March 19.1954, he rode a rocket-propelled sled that moved down a track at a speed of 632 mi/h . He and the sled were safely brought to rest in 1.40 s (Fig. P2.31). Determine (a) the negative acceleration he experienced and (b) the distance he traveled during this negative acceleration.

Answer :

The negative acceleration and distance is 451.42m/s² and 175.55m.

When an object experiences negative acceleration, its velocity changes in a negative direction, which can indicate that it is moving either slower or faster.

As a vector quantity that denotes both magnitude and direction, the term "acceleration" is used in physics to describe a change in an object's velocity.

Positive velocity, which is also a vector, makes something move more slowly than something experiencing negative acceleration. An object that has both negative acceleration and velocity, however, is actually moving faster.

a]. Negative Acceleration = dv/dt

 a=632/1.40=451.42m/s²

b]. distance= speed x time

d=632x 5/18=175.55m

To learn more about negative acceleration -

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