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:

Given initial velocity = 15 m/s and final velocity = 50 m/s and time = 4s

Acceleration of the object = Change in velocity/Time

= 50 - 15/4 = 35/4 = 8.75 m/s²

Average velocity = initial velocity + final velocity/2

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