8. If the velocity of an object changes from 15 m/s to 50 m/s during a time interval
of 4 s, what is the acceleration of the object?
9. If the acceleration in question 8 is constant, what's the average velocity of the
object described?

Acceleration of the object is 8.75 m/s² and average velocity is 32.5 m/s

Explanation:

Acceleration of the object = Change in velocity/Time

                                            = 50 - 15/4 = 35/4 = 8.75 m/s²

                                     = 15 + 50/2 = 65/2 = 32.5 m/s

it is the most commonly accepted one