3. how long does it take an object to decrease its
velocity from 64.0 m/s to 26.8 m/s if the acceleration
is -5.38 m/s? ?
how to solve for

t = 6.91 s

Explanation:

Given,

The initial velocity of the object, u = 64.0 m/s

The final velocity of the object, v = 26.8 m/s

The acceleration of the object, a = -5.38 m/s²

The formula for acceleration of the body is given by the relation

                                a = (v - u) /t     m/s²    

Solving for time

                                t = (v - u) / a      s

Substituting the values in the in the above equation

                                t = (26.8 - 64) / -5.38

                                  = 6.91 s

Hence, the time taken by the body is, t = 6.91 s

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this