Multiple choice velocity/acceleration

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SUMMARY

The discussion centers on the interpretation of a strobe photograph depicting a car's motion, where the intervals between successive images are decreasing. This indicates that the car is decelerating, leading to a negative average acceleration. Participants conclude that while the speed remains positive, the average velocity and average acceleration are negative due to the diminishing distance covered over equal time intervals. The correct answer to the multiple-choice question is option C: the average acceleration of the car.

PREREQUISITES
  • Understanding of basic physics concepts such as velocity and acceleration
  • Familiarity with strobe photography and its application in motion analysis
  • Knowledge of kinematic equations, specifically s = vt and 1/2 at²
  • Ability to interpret graphical representations of motion
NEXT STEPS
  • Study the principles of kinematics in physics, focusing on velocity and acceleration
  • Explore the concept of strobe photography and its uses in analyzing motion
  • Learn about negative acceleration and its implications in real-world scenarios
  • Review examples of motion graphs and their interpretations in physics
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Students of physics, educators teaching motion concepts, and anyone interested in the practical applications of strobe photography in analyzing motion dynamics.

williamx11373
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a strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing. If the direction of motion of the car is taken as positive, which of the following are negative?

a. the speed of the car
b. the average velocity of the car
c. the average acceleration of the car
d. all of the above


i never learned what a strobe photograph is, but I am guessing it is C. because it is slowing down and therefore diminishing.

is that correct ?
 
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A strobe photograph is basically an image in which multiple photos are overlayed, taken at fixed time intervals. I bet you have seen them before, like this one.

So in the question what they basically say is that the distance covered in the same time interval (say, 1 second) decreases.

Using what you know about physics (e.g. the s = v t and 1/2 a t^2 formulas for different types of motion) can you try to reason what is going on with the velocity and acceleration, and try to back your statement?
 

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