8} A 10 kg object is pushed on by multiple forces (10 N, -20 N, 110 N, 147N) in the x-direction. What is the acceleration of the object in the x-direction? 9} A 5 kg weight is placed inside a 0.5 kg shoe. The coefficient of static friction between the shoe and ground is 0.35. If you push on the shoe with a force of 19 N in the leftward direction, will the shoe slip? If not, what is the static friction force value? a) Yes b} No, 17 N c) No, -17 N d} No, 35 N e) No, -35 N 10} What average force (in Newtons) must be applied to a 0.4 kg ball travelling horizontally at 21.6 m/s (positive velocity) to reduce the velocity to -5 m/s in 0.20 seconds? Note: Remember to account for direction. 11} Assume now that force must be applied to the same ball (from Question 10) over 0.25 seconds. Did the average force value applied to the ball increase or decrease when it took more time to change the velocity? Note: Remember to distinguish between value and magnitude. 3) Increase b} Decrease