Question

what is the objects acceleration in section d? a. 0.67\\(\frac{m}{s^{2}}\\) b. 1.5\\(\frac{m}{s^{2}}\\) c. -0.67\\(\frac{m}{s^{2}}\\) d. -1.5\\(\frac{m}{s^{2}}\\) 15. at what time is the object not moving? a. 1 second b. 5 seconds c. 9 seconds d. 14 seconds 16. according to the law of falling bodies, if you drop a feather and a bowling ball in a large vacuum chamber, which object will land on the ground first? a. the feather b. the bowling ball c. neither, they both reach the bottom at the same time 17. in the absence of air resistance, objects fall at a constant... a. speed. b. velocity. c. acceleration. d. distances each successive second. 18. a ball is thrown straight up. at the top of its path, the instantaneous velocity is... a. 0\\(\frac{m}{s}\\). b. about 10\\(\frac{m}{s}\\). c. about -10\\(\frac{m}{s}\\). d. not enough information to tell. 19. a ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. during this time, the acceleration of the ball is always... a. in the direction of the motion. b. opposite its velocity. c. directed downward. d. directed upward. a ball is thrown upwards and caught when it comes back down. in the absence of air resistance, the velocity of the ball when caught would be... a. less than the speed it had when thrown upwards. b. more than the speed it had when thrown upwards. c. the same as the speed it had when thrown upwards.

Explanation:

Step1: Recall physics - motion concepts

For question 14, acceleration is the rate of change of velocity. Without a given graph for section D, we assume this is a conceptual - knowledge based question. In general physics knowledge, we need to analyze options.
For question 15, an object not moving has a velocity of 0. We need to know the relationship between velocity and time in motion.
For question 16, according to Galileo's law of falling bodies in a vacuum, all objects fall with the same acceleration regardless of mass.
For question 17, in the absence of air - resistance, objects in free - fall have a constant acceleration (acceleration due to gravity).
For question 18, at the top of the path of a vertically thrown object, its instantaneous velocity is 0 as it momentarily stops before falling back down.
For question 19, the acceleration of a ball in free - fall (thrown up and coming back down) is always the acceleration due to gravity, which is directed downward.
For question 20, in the absence of air resistance, mechanical energy is conserved. So the speed of the ball when caught is the same as the speed when thrown upwards.

Answer:

1. (No answer as no graph for section D is provided)
2. a. 1 second (assuming based on general motion concepts where velocity is 0 at some point; without a graph this is a general physics knowledge answer)
3. c. Neither, they both reach the bottom at the same time
4. c. acceleration
5. a. $0\frac{m}{s}$
6. c. directed downward
7. c. The same as the speed it had when thrown upwards