9. What was the average acceleration of the car from 40 seconds to 46 seconds? Include the
correct units. Remember that A means final value minus initial value. What does the
negative number of your

A) 9.2 m/s^2

B) The negative sign means the car is accelerating

C) -9.2 m/s^2

D) The negative sign means the car has crashed

E) -9.2 m/s

F) The negative sign means the car is decelerating

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f