9-18 questions. I need help with these multiple choice questions

Question 11 {1 point} clI: Avector is different from a scalar because 0 A} a vector has a number and a unit whereas a scalar has a number only. 0 El a vector has mass whereas a scalar does not have mass. 0 Cl a vector measures speed whereas a scalar measures velocitv. O D} a vector has direction whereas a scalar does not have direction. Question 12 {1 point} El 13 II Which of the following statements about motion graphs is incorrect? O A} The area under a velocitvvtime graph gives displacement. 0 Bl The area under a position-time graph gives velocitv. 0 Cl The slope of a velocitv-time graph gives acceleration. O Ell The slope of a position-time graph gives velocitv. Question 13 (1 point) j Listen Robert left home and went for a jog. He jogged 2.0 km [N], then 3.0 km [S] followed by 4.0 km [N]. What is Robert's final position from home? O A) 3.0 km [S] B) 9.0 km [N] O C) 0.0 km O D) 3.0 km [N] Question 14 (1 point) () Listen If a box has a weight of 1000 N, its mass is: OA) 9800 kg OB) 102 kg O C) 1000 kg [down] OD) 1000 kgQuestion 15 (1 point) () Listen A 30 kg box is lifted from the ground to a height of 1.5 m. The work done is: O A) 45 J O B) 4.6 J OC) 441 J D) 20 J Question 16 (1 point) () Listen If the amount of friction present in a moving machine decreases, O A) the energy lost to heat increases and the percent efficiency decreases. B) the energy lost to heat decreases and the percent efficiency increases. O C) the energy lost to heat decreases and the percent efficiency decreases. ( D) the energy lost to heat increases and the percent efficiency increases.Question 9 {1 point] III-II A net force acts on an object. The object will likely: O A} move at constant velocity 0 31 remain stationary O C} accelerate O D} move at constant speed Question '10 {1 point] III-II In Newton's Third Law, the action and reaction forces 0 A} are only equal if the object is stationary. 0 BJ act on the same object. O C} are only equal if the object is moving with constant velocity. 0 D} act on different objects. Question 1? {1 point] I Ilij Llsten n The force that ultimately lifts a basketball player upwards off the court in a slam- dunk jump is the: Q \"all normal force 0 Bl tension 0 Cl applied force 0 Bl torque Question 13 {1 point} El 13 II A boy on a swing is pulled to a position 2.34 m off the ground and released. At the fastest and lowest point of the swing the boy is [3.5!] m off the ground and travelling 3 mfs. The percent efficiency of this swing system is: O A} 10% 0 El 25% 0 Ci SD96 Omens